fernflower/src/org/jetbrains/java/decompiler/main/ClassWriter.java

/*
 *    Fernflower - The Analytical Java Decompiler
 *    http://www.reversed-java.com
 *
 *    (C) 2008 - 2010, Stiver
 *
 *    This software is NEITHER public domain NOR free software 
 *    as per GNU License. See license.txt for more details.
 *
 *    This software is distributed WITHOUT ANY WARRANTY; without 
 *    even the implied warranty of MERCHANTABILITY or FITNESS FOR 
 *    A PARTICULAR PURPOSE. 
 */

package org.jetbrains.java.decompiler.main;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;

import org.jetbrains.java.decompiler.code.CodeConstants;
import org.jetbrains.java.decompiler.main.ClassesProcessor.ClassNode;
import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
import org.jetbrains.java.decompiler.main.rels.ClassWrapper;
import org.jetbrains.java.decompiler.main.rels.MethodWrapper;
import org.jetbrains.java.decompiler.modules.decompiler.ExprProcessor;
import org.jetbrains.java.decompiler.modules.decompiler.exps.AnnotationExprent;
import org.jetbrains.java.decompiler.modules.decompiler.exps.ConstExprent;
import org.jetbrains.java.decompiler.modules.decompiler.exps.Exprent;
import org.jetbrains.java.decompiler.modules.decompiler.exps.NewExprent;
import org.jetbrains.java.decompiler.modules.decompiler.stats.RootStatement;
import org.jetbrains.java.decompiler.modules.decompiler.vars.VarTypeProcessor;
import org.jetbrains.java.decompiler.modules.decompiler.vars.VarVersionPaar;
import org.jetbrains.java.decompiler.modules.renamer.PoolInterceptor;
import org.jetbrains.java.decompiler.struct.StructClass;
import org.jetbrains.java.decompiler.struct.StructField;
import org.jetbrains.java.decompiler.struct.StructMethod;
import org.jetbrains.java.decompiler.struct.attr.StructAnnDefaultAttribute;
import org.jetbrains.java.decompiler.struct.attr.StructAnnotationAttribute;
import org.jetbrains.java.decompiler.struct.attr.StructAnnotationParameterAttribute;
import org.jetbrains.java.decompiler.struct.attr.StructConstantValueAttribute;
import org.jetbrains.java.decompiler.struct.attr.StructExceptionsAttribute;
import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
import org.jetbrains.java.decompiler.struct.attr.StructGenericSignatureAttribute;
import org.jetbrains.java.decompiler.struct.consts.PrimitiveConstant;
import org.jetbrains.java.decompiler.struct.gen.FieldDescriptor;
import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
import org.jetbrains.java.decompiler.struct.gen.VarType;
import org.jetbrains.java.decompiler.struct.gen.generics.GenericClassDescriptor;
import org.jetbrains.java.decompiler.struct.gen.generics.GenericFieldDescriptor;
import org.jetbrains.java.decompiler.struct.gen.generics.GenericMain;
import org.jetbrains.java.decompiler.struct.gen.generics.GenericMethodDescriptor;
import org.jetbrains.java.decompiler.struct.gen.generics.GenericType;
import org.jetbrains.java.decompiler.util.InterpreterUtil;
import org.jetbrains.java.decompiler.util.VBStyleCollection;

public class ClassWriter {
	
	private static final int[] modval_class = new int[] {CodeConstants.ACC_PUBLIC, CodeConstants.ACC_PROTECTED, CodeConstants.ACC_PRIVATE, 
			CodeConstants.ACC_ABSTRACT, CodeConstants.ACC_STATIC, CodeConstants.ACC_FINAL, CodeConstants.ACC_STRICT};
	
	private static final String[] modstr_class = new String[] {"public ", "protected ", "private ", "abstract ", "static ", "final ", "strictfp "};
	
	private static final int[] modval_field = new int[] {CodeConstants.ACC_PUBLIC, CodeConstants.ACC_PROTECTED, CodeConstants.ACC_PRIVATE, 
			 CodeConstants.ACC_STATIC, CodeConstants.ACC_FINAL, CodeConstants.ACC_TRANSIENT, CodeConstants.ACC_VOLATILE};
	
	private static final String[] modstr_field = new String[] {"public ", "protected ", "private ", "static ", "final ", "transient ", "volatile "};
	
	private static final int[] modval_meth = new int[] {CodeConstants.ACC_PUBLIC, CodeConstants.ACC_PROTECTED, CodeConstants.ACC_PRIVATE, 
			CodeConstants.ACC_ABSTRACT, CodeConstants.ACC_STATIC, CodeConstants.ACC_FINAL, CodeConstants.ACC_SYNCHRONIZED, 
			CodeConstants.ACC_NATIVE, CodeConstants.ACC_STRICT};
	
	private static final String[] modstr_meth = new String[] {"public ", "protected ", "private ", "abstract ", "static ", "final ", "synchronized ", "native ", "strictfp "};
	
	private static final HashSet<Integer> mod_notinterface = new HashSet<Integer>(Arrays.asList(new Integer[] {CodeConstants.ACC_ABSTRACT, CodeConstants.ACC_STATIC}));
	private static final HashSet<Integer> mod_notinterface_fields = new HashSet<Integer>(Arrays.asList(new Integer[] {CodeConstants.ACC_PUBLIC, CodeConstants.ACC_STATIC, CodeConstants.ACC_FINAL}));
	private static final HashSet<Integer> mod_notinterface_meth = new HashSet<Integer>(Arrays.asList(new Integer[] {CodeConstants.ACC_PUBLIC, CodeConstants.ACC_ABSTRACT}));
	
	private ClassReference14Processor ref14processor;
	
	private PoolInterceptor interceptor;
	
	public ClassWriter() {
		ref14processor = new ClassReference14Processor();
		interceptor = DecompilerContext.getPoolInterceptor();
	}

	
	private void invokeProcessors(ClassNode node) {

		ClassWrapper wrapper = node.wrapper;
		StructClass cl = wrapper.getClassStruct();
		
		InitializerProcessor.extractInitializers(wrapper);
		
		if(node.type == ClassNode.CLASS_ROOT && DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_CLASS_1_4)) {
			ref14processor.processClassReferences(node);
		}
		
		if(DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM) && (cl.access_flags & CodeConstants.ACC_ENUM) != 0) {
			EnumProcessor.clearEnum(wrapper);
		}

		if(DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ASSERTIONS)) {
			AssertProcessor.buildAssertions(node);
		}

	}
	
	public void classLambdaToJava(ClassNode node, BufferedWriter writer, Exprent method_object, int indent) throws IOException {

		// get the class node with the content method
		ClassNode node_content = node;
		while(node_content != null && node_content.type == ClassNode.CLASS_LAMBDA) {
			node_content = node_content.parent;
		}
		
		if(node_content == null) {
			return;
		}

		boolean lambda_to_anonymous = DecompilerContext.getOption(IFernflowerPreferences.LAMBDA_TO_ANONYMOUS_CLASS);
		
		ClassNode nodeold = (ClassNode)DecompilerContext.getProperty(DecompilerContext.CURRENT_CLASSNODE);
		DecompilerContext.setProperty(DecompilerContext.CURRENT_CLASSNODE, node);
		
		ClassWrapper wrapper = node_content.wrapper;
		StructClass cl = wrapper.getClassStruct();

		DecompilerContext.getLogger().startWriteClass(node.simpleName);

		if(node.lambda_information.is_method_reference) {

			if(!node.lambda_information.is_content_method_static && method_object != null) { // reference to a virtual method
				writer.write(method_object.toJava(indent));
			} else { // reference to a static method 
				writer.write(ExprProcessor.getCastTypeName(new VarType(node.lambda_information.content_class_name, false)));
			}
			
    		writer.write("::");
    		writer.write(node.lambda_information.content_method_name);
    
    		writer.flush();
			
		} else {
		
    		// lambda method
    		StructMethod mt = cl.getMethod(node.lambda_information.content_method_key);
    		MethodWrapper meth = wrapper.getMethodWrapper(mt.getName(), mt.getDescriptor());
    		
    		MethodDescriptor md_content = MethodDescriptor.parseDescriptor(node.lambda_information.content_method_descriptor);
    		MethodDescriptor md_lambda = MethodDescriptor.parseDescriptor(node.lambda_information.method_descriptor);
    
    		if(!lambda_to_anonymous) { // lambda parameters '() ->'
    
    			StringBuilder buff = new StringBuilder("(");
    
    			boolean firstpar = true;
    			int index = node.lambda_information.is_content_method_static ? 0 : 1;;
    			
    			int start_index = md_content.params.length - md_lambda.params.length;
    			
    			for(int i=0;i<md_content.params.length;i++) {
    					
    				if(i >= start_index) {
    
    					if(!firstpar) {
    						buff.append(", ");
    					}
    					
    					String parname = meth.varproc.getVarName(new VarVersionPaar(index, 0));
    					buff.append(parname==null ? "param"+index : parname); // null iff decompiled with errors
    					
    					firstpar = false;
    				}
    				
    				index+=md_content.params[i].stack_size;
    			}
    			buff.append(") ->");
    			
    			writer.write(buff.toString());
    		}
    		
    		StringWriter strwriter = new StringWriter();
    		BufferedWriter bufstrwriter = new BufferedWriter(strwriter);
    
    		if(lambda_to_anonymous) {
    			methodLambdaToJava(node, node_content, mt, bufstrwriter, indent+1, false);
    		} else {
    			methodLambdaToJava(node, node_content, mt, bufstrwriter, indent, true);
    		}
    
    		bufstrwriter.flush();
    		
    		// closing up class definition
    		writer.write(" {");
    		writer.write(DecompilerContext.getNewLineSeparator());
    
    		writer.write(strwriter.toString());
    
    		writer.write(InterpreterUtil.getIndentString(indent));
    		writer.write("}");
    		writer.flush();
		}

		DecompilerContext.setProperty(DecompilerContext.CURRENT_CLASSNODE, nodeold);

		DecompilerContext.getLogger().endWriteClass();
	}
	
	public void classToJava(ClassNode node, BufferedWriter writer, int indent) throws IOException {
		
		ClassWrapper wrapper = node.wrapper;
		StructClass cl = wrapper.getClassStruct();

		ClassNode nodeold = (ClassNode)DecompilerContext.getProperty(DecompilerContext.CURRENT_CLASSNODE);
		DecompilerContext.setProperty(DecompilerContext.CURRENT_CLASSNODE, node);

		// last minute processing
		invokeProcessors(node);
		
		DecompilerContext.getLogger().startWriteClass(cl.qualifiedName);
		
		writeClassDefinition(node, writer, indent);
		
		// methods
		StringWriter strwriter = new StringWriter();
		BufferedWriter bufstrwriter = new BufferedWriter(strwriter);

		boolean firstmt = true;
		boolean mthidden = false;
		
		for(StructMethod mt : cl.getMethods()) {

			int flags = mt.getAccessFlags();

			boolean isSynthetic = (flags & CodeConstants.ACC_SYNTHETIC) != 0 || mt.getAttributes().containsKey("Synthetic");
			boolean isBridge = (flags & CodeConstants.ACC_BRIDGE) != 0;

			if((!isSynthetic || !DecompilerContext.getOption(IFernflowerPreferences.REMOVE_SYNTHETIC)) &&
					(!isBridge || !DecompilerContext.getOption(IFernflowerPreferences.REMOVE_BRIDGE)) &&
					!wrapper.getHideMembers().contains(InterpreterUtil.makeUniqueKey(mt.getName(), mt.getDescriptor()))) {
				if(!mthidden && (!firstmt || node.type != ClassNode.CLASS_ANONYMOUS)) {
					bufstrwriter.write(DecompilerContext.getNewLineSeparator());
					firstmt = false;
				}

				mthidden = !methodToJava(node, mt, bufstrwriter, indent+1);
			}
		}
		bufstrwriter.flush();

		StringWriter strwriter1 = new StringWriter();
		BufferedWriter bufstrwriter1 = new BufferedWriter(strwriter1);
		
		int fields_count = 0;
		
		boolean enumfields = false;
		
		// fields
		for(StructField fd: cl.getFields()) {
			int flags = fd.access_flags;
			boolean isSynthetic = (flags & CodeConstants.ACC_SYNTHETIC) != 0 || fd.getAttributes().containsKey("Synthetic");
			if((!isSynthetic || !DecompilerContext.getOption(IFernflowerPreferences.REMOVE_SYNTHETIC))
					&& !wrapper.getHideMembers().contains(InterpreterUtil.makeUniqueKey(fd.getName(), fd.getDescriptor()))) {
				
				boolean isEnum = DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM) && (flags & CodeConstants.ACC_ENUM) != 0; 
				if(isEnum) {
					if(enumfields) {
						bufstrwriter1.write(",");
						bufstrwriter1.write(DecompilerContext.getNewLineSeparator());
					} else {
						enumfields = true;
					}
				} else {
					if(enumfields) {
						bufstrwriter1.write(";");
						bufstrwriter1.write(DecompilerContext.getNewLineSeparator());
						enumfields = false;
					}
				}
				
				fieldToJava(wrapper, cl, fd, bufstrwriter1, indent+1);
				fields_count++;
			}
		}
		
		if(enumfields) {
			bufstrwriter1.write(";");
			bufstrwriter1.write(DecompilerContext.getNewLineSeparator());
		}
		
		bufstrwriter1.flush();
		
		if(fields_count > 0) {
			writer.write(DecompilerContext.getNewLineSeparator());
			writer.write(strwriter1.toString());
			writer.write(DecompilerContext.getNewLineSeparator());
		}
		

		// methods
		writer.write(strwriter.toString());

		// member classes
		for(ClassNode inner : node.nested) {
			if(inner.type == ClassNode.CLASS_MEMBER) {
				StructClass innercl = inner.classStruct;
				
				boolean isSynthetic = ((inner.access | innercl.access_flags) & CodeConstants.ACC_SYNTHETIC) != 0 || innercl.getAttributes().containsKey("Synthetic");
				if((!isSynthetic || !DecompilerContext.getOption(IFernflowerPreferences.REMOVE_SYNTHETIC))
						&& !wrapper.getHideMembers().contains(innercl.qualifiedName)) {
					writer.write(DecompilerContext.getNewLineSeparator());
					classToJava(inner, writer, indent+1);
				}
			}
		}
		
		writer.write(InterpreterUtil.getIndentString(indent));
		writer.write("}");
		if(node.type != ClassNode.CLASS_ANONYMOUS) {
			writer.write(DecompilerContext.getNewLineSeparator());
		}
		writer.flush();

		DecompilerContext.setProperty(DecompilerContext.CURRENT_CLASSNODE, nodeold);

		DecompilerContext.getLogger().endWriteClass();
	}
	
	private void writeClassDefinition(ClassNode node, BufferedWriter writer, int indent) throws IOException {

		if(node.type == ClassNode.CLASS_ANONYMOUS) {
			writer.write(" {");
			writer.write(DecompilerContext.getNewLineSeparator());
		} else {
			
			String indstr = InterpreterUtil.getIndentString(indent);
			
			ClassWrapper wrapper = node.wrapper;
			StructClass cl = wrapper.getClassStruct();
			
			int flags = node.type == ClassNode.CLASS_ROOT?cl.access_flags:node.access;
			boolean isInterface = (flags & CodeConstants.ACC_INTERFACE) != 0;
			boolean isAnnotation = (flags & CodeConstants.ACC_ANNOTATION) != 0;
			boolean isEnum = DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM) && (flags & CodeConstants.ACC_ENUM) != 0;
			
			boolean isDeprecated = cl.getAttributes().containsKey("Deprecated");
			
			if(interceptor != null) {
				String oldname = interceptor.getOldName(cl.qualifiedName);
				if(oldname != null) {
					writer.write(indstr);
					writer.write("// $FF: renamed from: "+getDescriptorPrintOut(oldname, 0));
					writer.write(DecompilerContext.getNewLineSeparator());
				}
			}

			if (isDeprecated) {
				writer.write(indstr);
				writer.write("/** @deprecated */");
				writer.write(DecompilerContext.getNewLineSeparator());
			}

			// class annotations
			List<AnnotationExprent> lstAnn = getAllAnnotations(cl.getAttributes());
			for(AnnotationExprent annexpr : lstAnn) {
				writer.write(annexpr.toJava(indent));
				writer.write(DecompilerContext.getNewLineSeparator());
			}

			boolean isSynthetic = (flags & CodeConstants.ACC_SYNTHETIC) != 0 || cl.getAttributes().containsKey("Synthetic");
			
			if(isSynthetic) {
				writer.write(indstr);
				writer.write("// $FF: synthetic class");
				writer.write(DecompilerContext.getNewLineSeparator());
			}

			writer.write(indstr);
			
			if(isEnum) {
				// remove abstract and final flags (JLS 8.9 Enums)
				flags &=~CodeConstants.ACC_ABSTRACT;	
				flags &=~CodeConstants.ACC_FINAL;	
			}
			
			for(int i=0;i<modval_class.length;i++) {
				if(!isInterface || !mod_notinterface.contains(modval_class[i])) {
					if((flags & modval_class[i]) != 0) {
						writer.write(modstr_class[i]);
					} 
				}
			}

			if(isEnum) {
				writer.write("enum ");
			}else if(isInterface) {
				if(isAnnotation) {
					writer.write("@");
				}
				writer.write("interface ");
			} else {
				writer.write("class ");
			}
			
			GenericClassDescriptor descriptor = null;
			if(DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES)) {
				StructGenericSignatureAttribute attr = (StructGenericSignatureAttribute)cl.getAttributes().getWithKey("Signature");
				if(attr != null) {
					descriptor = GenericMain.parseClassSignature(attr.getSignature());
				}
			}
			
			writer.write(node.simpleName);
			if(descriptor != null && !descriptor.fparameters.isEmpty()) {
				writer.write("<");
				for(int i=0;i<descriptor.fparameters.size();i++) {
					if(i>0) {
						writer.write(", ");
					}
					writer.write(descriptor.fparameters.get(i));
					
					List<GenericType> lstBounds = descriptor.fbounds.get(i);
          if (lstBounds.size() > 1 || !"java/lang/Object".equals(lstBounds.get(0).value)) {
            writer.write(" extends ");
            writer.write(GenericMain.getGenericCastTypeName(lstBounds.get(0)));

            for(int j=1;j<lstBounds.size();j++) {
              writer.write(" & " + GenericMain.getGenericCastTypeName(lstBounds.get(j)));
            }
          }
				}
				writer.write(">");
			}
			writer.write(" ");
			
			if(!isEnum && !isInterface && cl.superClass != null) {
				VarType supertype = new VarType(cl.superClass.getString(), true);
				if(!VarType.VARTYPE_OBJECT.equals(supertype)) {
					writer.write("extends ");
					if(descriptor != null) {
						writer.write(GenericMain.getGenericCastTypeName(descriptor.superclass));
					} else {
						writer.write(ExprProcessor.getCastTypeName(supertype));
					}
					writer.write(" ");
				}
			}
			
			if(!isAnnotation) {
				int[] interfaces = cl.getInterfaces();
				if(interfaces.length > 0) {
					writer.write(isInterface?"extends ":"implements ");
					for(int i=0;i<interfaces.length;i++) {
						if(i>0) {
							writer.write(", ");
						}
						if(descriptor != null) {
							writer.write(GenericMain.getGenericCastTypeName(descriptor.superinterfaces.get(i)));
						} else {
							writer.write(ExprProcessor.getCastTypeName(new VarType(cl.getInterface(i), true)));
						}
					}
					writer.write(" ");
				}
			}
			
			writer.write("{");
			writer.write(DecompilerContext.getNewLineSeparator());
		}
		
	}
	
	private void fieldToJava(ClassWrapper wrapper, StructClass cl, StructField fd, BufferedWriter writer, int indent) throws IOException {
		
		String indstr = InterpreterUtil.getIndentString(indent);
		
		boolean isInterface = (cl.access_flags & CodeConstants.ACC_INTERFACE) != 0;
		int flags = fd.access_flags;

		if(interceptor != null) {
			String oldname = interceptor.getOldName(cl.qualifiedName+" "+fd.getName()+" "+fd.getDescriptor());
			if(oldname != null) {
				String[] element = oldname.split(" ");
				
				writer.write(indstr);
				writer.write("// $FF: renamed from: "+element[1]+" "+getDescriptorPrintOut(element[2], 1));
				writer.write(DecompilerContext.getNewLineSeparator());
			}
		}
		
		boolean isDeprecated = fd.getAttributes().containsKey("Deprecated");

		if (isDeprecated) {
			writer.write(indstr);
			writer.write("/** @deprecated */");
			writer.write(DecompilerContext.getNewLineSeparator());
		}

		// field annotations
		List<AnnotationExprent> lstAnn = getAllAnnotations(fd.getAttributes());
		for(AnnotationExprent annexpr : lstAnn) {
			writer.write(annexpr.toJava(indent));
			writer.write(DecompilerContext.getNewLineSeparator());
		}

		boolean isSynthetic = (flags & CodeConstants.ACC_SYNTHETIC) != 0 || fd.getAttributes().containsKey("Synthetic");
		boolean isEnum = DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM) && (flags & CodeConstants.ACC_ENUM) != 0;
		
		if(isSynthetic) {
			writer.write(indstr);
			writer.write("// $FF: synthetic field");
			writer.write(DecompilerContext.getNewLineSeparator());
		}

		writer.write(indstr);
		
		if(!isEnum) {
			for(int i=0;i<modval_field.length;i++) {
				if(!isInterface || !mod_notinterface_fields.contains(modval_field[i])) {
					if((flags & modval_field[i]) != 0) {
						writer.write(modstr_field[i]);
					}
				}
			}
		}
		
		VarType fieldType = new VarType(fd.getDescriptor(), false); 
		
		GenericFieldDescriptor descriptor = null;
		if(DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES)) {
			StructGenericSignatureAttribute attr = (StructGenericSignatureAttribute)fd.getAttributes().getWithKey("Signature");
			if(attr != null) {
				descriptor = GenericMain.parseFieldSignature(attr.getSignature());
			}
		}
		
		if(!isEnum) {
			if(descriptor != null) {
				writer.write(GenericMain.getGenericCastTypeName(descriptor.type));
			} else {
				writer.write(ExprProcessor.getCastTypeName(fieldType));
			}
			writer.write(" ");
		}

		writer.write(fd.getName());
		
		Exprent initializer;
		if((flags & CodeConstants.ACC_STATIC) != 0) {
			initializer = wrapper.getStaticFieldInitializers().getWithKey(InterpreterUtil.makeUniqueKey(fd.getName(), fd.getDescriptor()));
		} else {
			initializer = wrapper.getDynamicFieldInitializers().getWithKey(InterpreterUtil.makeUniqueKey(fd.getName(), fd.getDescriptor()));
		}
		 
		if(initializer != null) {
			if(isEnum && initializer.type == Exprent.EXPRENT_NEW) {
				NewExprent nexpr = (NewExprent)initializer;
				nexpr.setEnumconst(true);
				writer.write(nexpr.toJava(indent));
			} else {
				writer.write(" = ");
				writer.write(initializer.toJava(indent));
			}
		} else if((flags & CodeConstants.ACC_FINAL) != 0 && (flags & CodeConstants.ACC_STATIC) != 0) {
			StructConstantValueAttribute attr = (StructConstantValueAttribute)fd.getAttributes().getWithKey(StructGeneralAttribute.ATTRIBUTE_CONSTANT_VALUE);
			if(attr != null) {
				PrimitiveConstant cnst = cl.getPool().getPrimitiveConstant(attr.getIndex());
				writer.write(" = ");
				writer.write(new ConstExprent(fieldType, cnst.value).toJava(indent));
			}
		}
		
		if(!isEnum) {
			writer.write(";");
			writer.write(DecompilerContext.getNewLineSeparator());
		}
		
	}
	
	public boolean methodLambdaToJava(ClassNode node_lambda, ClassNode node_content, StructMethod mt, BufferedWriter writer, int indent, boolean code_only) throws IOException {
		
		ClassWrapper wrapper = node_content.wrapper;
		
		MethodWrapper meth = wrapper.getMethodWrapper(mt.getName(), mt.getDescriptor());
		
		MethodWrapper methold = (MethodWrapper)DecompilerContext.getProperty(DecompilerContext.CURRENT_METHOD_WRAPPER);
		DecompilerContext.setProperty(DecompilerContext.CURRENT_METHOD_WRAPPER, meth);

		String indstr = InterpreterUtil.getIndentString(indent);

		String method_name = node_lambda.lambda_information.method_name;
		MethodDescriptor md_content = MethodDescriptor.parseDescriptor(node_lambda.lambda_information.content_method_descriptor);
		MethodDescriptor md_lambda = MethodDescriptor.parseDescriptor(node_lambda.lambda_information.method_descriptor);
		
		StringWriter strwriter = new StringWriter();
		BufferedWriter bufstrwriter = new BufferedWriter(strwriter); 

		if(!code_only) {
			bufstrwriter.write(indstr);
			bufstrwriter.write("public ");
			bufstrwriter.write(method_name);
			bufstrwriter.write("(");
	
			boolean firstpar = true;
			int index = node_lambda.lambda_information.is_content_method_static ? 0 : 1;;
			
			int start_index = md_content.params.length - md_lambda.params.length;
			
			for(int i=0;i<md_content.params.length;i++) {
				
				if(i >= start_index) {
				
					if(!firstpar) {
						bufstrwriter.write(", ");
					}
					
					VarType partype = md_content.params[i].copy();
					
					String strpartype = ExprProcessor.getCastTypeName(partype);
					if(ExprProcessor.UNDEFINED_TYPE_STRING.equals(strpartype) && DecompilerContext.getOption(IFernflowerPreferences.UNDEFINED_PARAM_TYPE_OBJECT)) {
						strpartype = ExprProcessor.getCastTypeName(VarType.VARTYPE_OBJECT);
					}
		
					bufstrwriter.write(strpartype);
					bufstrwriter.write(" ");
					
					String parname = meth.varproc.getVarName(new VarVersionPaar(index, 0));
					bufstrwriter.write(parname==null?"param"+index:parname); // null iff decompiled with errors
					
					firstpar = false;
				}
				
				index+=md_content.params[i].stack_size;
			}
			
			bufstrwriter.write(")");
			bufstrwriter.write(" ");
			bufstrwriter.write("{");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		}
		
		RootStatement root = wrapper.getMethodWrapper(mt.getName(), mt.getDescriptor()).root;
		
		if(root != null && !meth.decompiledWithErrors) { // check for existence 
			try {
				String code = root.toJava(indent+1);
				bufstrwriter.write(code);
			} catch(Throwable ex) {
				DecompilerContext.getLogger().writeMessage("Method "+mt.getName()+" "+mt.getDescriptor()+" couldn't be written.", ex);
				meth.decompiledWithErrors = true;
			}
		} 
		
		if(meth.decompiledWithErrors) {
			bufstrwriter.write(InterpreterUtil.getIndentString(indent+1));
			bufstrwriter.write("// $FF: Couldn't be decompiled");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		}

		if(!code_only) {
			bufstrwriter.write(indstr+"}");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		}
		
		bufstrwriter.flush();
		
		writer.write(strwriter.toString());
		
		DecompilerContext.setProperty(DecompilerContext.CURRENT_METHOD_WRAPPER, methold);
		
		return true;
	}

	public boolean methodToJava(ClassNode node, StructMethod mt, BufferedWriter writer, int indent) throws IOException {

		ClassWrapper wrapper = node.wrapper;
		StructClass cl = wrapper.getClassStruct();
		
		MethodWrapper meth = wrapper.getMethodWrapper(mt.getName(), mt.getDescriptor());
		
		MethodWrapper methold = (MethodWrapper)DecompilerContext.getProperty(DecompilerContext.CURRENT_METHOD_WRAPPER);
		DecompilerContext.setProperty(DecompilerContext.CURRENT_METHOD_WRAPPER, meth);
		
		boolean isInterface = (cl.access_flags & CodeConstants.ACC_INTERFACE) != 0;
		boolean isAnnotation = (cl.access_flags & CodeConstants.ACC_ANNOTATION) != 0;
		boolean isEnum = (cl.access_flags & CodeConstants.ACC_ENUM) != 0 && DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_ENUM);
		boolean isDeprecated = mt.getAttributes().containsKey("Deprecated");
		
		String indstr = InterpreterUtil.getIndentString(indent);
		boolean clinit = false, init = false, dinit = false;
		
		MethodDescriptor md = MethodDescriptor.parseDescriptor(mt.getDescriptor());
		
		StringWriter strwriter = new StringWriter();
		BufferedWriter bufstrwriter = new BufferedWriter(strwriter); 
		
		int flags = mt.getAccessFlags();
		if((flags & CodeConstants.ACC_NATIVE) != 0) {
			flags &= ~CodeConstants.ACC_STRICT; // compiler bug: a strictfp class sets all methods to strictfp 
		}
		
		if("<clinit>".equals(mt.getName())) {
			flags &= CodeConstants.ACC_STATIC; // ingnore all modifiers except 'static' in a static initializer 
		}
		
		if(interceptor != null) {
			String oldname = interceptor.getOldName(cl.qualifiedName+" "+mt.getName()+" "+mt.getDescriptor());
			if(oldname != null) {
				String[] element = oldname.split(" ");
				
				bufstrwriter.write(indstr);
				bufstrwriter.write("// $FF: renamed from: "+element[1]+" "+getDescriptorPrintOut(element[2], 2));
				bufstrwriter.write(DecompilerContext.getNewLineSeparator());
			}
		}

		if (isDeprecated) {
			writer.write(indstr);
			writer.write("/** @deprecated */");
			writer.write(DecompilerContext.getNewLineSeparator());
		}

		// method annotations
		List<AnnotationExprent> lstAnn = getAllAnnotations(mt.getAttributes());
		for(AnnotationExprent annexpr : lstAnn) {
			bufstrwriter.write(annexpr.toJava(indent));
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		}

		boolean isSynthetic = (flags & CodeConstants.ACC_SYNTHETIC) != 0 || mt.getAttributes().containsKey("Synthetic");
		boolean isBridge = (flags & CodeConstants.ACC_BRIDGE) != 0;
		
		if(isSynthetic) {
			bufstrwriter.write(indstr);
			bufstrwriter.write("// $FF: synthetic method");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		}

		if(isBridge) {
			bufstrwriter.write(indstr);
			bufstrwriter.write("// $FF: bridge method");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		}

		bufstrwriter.write(indstr);
		for(int i=0;i<modval_meth.length;i++) {
			if(!isInterface || !mod_notinterface_meth.contains(modval_meth[i])) {
				if((flags & modval_meth[i]) != 0) {
					bufstrwriter.write(modstr_meth[i]);
				}
			}
		}
		
		// 'default' modifier (Java 8)
		if(isInterface && mt.containsCode()) {
			bufstrwriter.write("default ");
		}

		String name = mt.getName();
		if ("<init>".equals(name)) {
			if (node.type == ClassNode.CLASS_ANONYMOUS) {
				name = "";
				dinit = true;
			} else {
				name = node.simpleName;
				init = true;
			}
		} else if ("<clinit>".equals(name)) {
			name = "";
			clinit = true;
		}

		GenericMethodDescriptor descriptor = null;
		if(DecompilerContext.getOption(IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES)) {
			StructGenericSignatureAttribute attr = (StructGenericSignatureAttribute)mt.getAttributes().getWithKey("Signature");
			if(attr != null) {
				descriptor = GenericMain.parseMethodSignature(attr.getSignature());
        int actualParams = md.params.length;
        if(isEnum && init) actualParams -= 2;
        if(actualParams != descriptor.params.size()) {
					DecompilerContext.getLogger().writeMessage("Inconsistent generic signature in method "+mt.getName()+" "+mt.getDescriptor(), IFernflowerLogger.WARNING);
					descriptor = null;
				}
			}
		}
		
		boolean throwsExceptions = false;
		
		int param_count_explicit = 0;
		
		if(!clinit && !dinit) {
			
			boolean thisvar = (mt.getAccessFlags() & CodeConstants.ACC_STATIC) == 0;

			// formal type parameters
			if(descriptor != null && !descriptor.fparameters.isEmpty()) {
				bufstrwriter.write("<");
				for(int i=0;i<descriptor.fparameters.size();i++) {
					if(i>0) {
						bufstrwriter.write(", ");
					}
					bufstrwriter.write(descriptor.fparameters.get(i));
					
					List<GenericType> lstBounds = descriptor.fbounds.get(i);
					if (lstBounds.size() > 1 || !"java/lang/Object".equals(lstBounds.get(0).value)) {
						bufstrwriter.write(" extends ");
						bufstrwriter.write(GenericMain.getGenericCastTypeName(lstBounds.get(0)));

						for(int j = 1; j < lstBounds.size(); j++) {
							bufstrwriter.write(" & " + GenericMain.getGenericCastTypeName(lstBounds.get(j)));
						}
					}
				}
				bufstrwriter.write("> ");
			}
			
			if(!init) {
				if(descriptor != null) {
					bufstrwriter.write(GenericMain.getGenericCastTypeName(descriptor.ret));
				} else {
					bufstrwriter.write(ExprProcessor.getCastTypeName(md.ret));
				}
				bufstrwriter.write(" ");
			}

			bufstrwriter.write(name);
			bufstrwriter.write("(");
			
			// parameter annotations
			List<List<AnnotationExprent>> lstParAnn = getAllParameterAnnotations(mt.getAttributes()); 
			
			List<VarVersionPaar> signFields = meth.signatureFields;
			
			// compute last visible parameter
			int lastparam_index = -1;
			for(int i=0;i<md.params.length;i++) {
				if(signFields == null || signFields.get(i) == null) {
					lastparam_index = i;
				}
			}

			boolean firstpar = true;
			int index = isEnum && init ? 3 : thisvar ? 1 : 0;
			int start = isEnum && init && descriptor == null ? 2 : 0;
			int params = descriptor == null ? md.params.length : descriptor.params.size();
			for(int i = start; i < params; i++) {
				if (signFields == null || signFields.get(i) == null) {
					
					if(!firstpar) {
						bufstrwriter.write(", ");
					}
					
					if(lstParAnn.size() > param_count_explicit) {
						List<AnnotationExprent> annotations = lstParAnn.get(param_count_explicit);
						for(int j=0;j<annotations.size();j++) {
							AnnotationExprent annexpr = annotations.get(j);
							if(annexpr.getAnnotationType() == AnnotationExprent.ANNOTATION_NORMAL) {
								bufstrwriter.write(DecompilerContext.getNewLineSeparator());
								bufstrwriter.write(annexpr.toJava(indent+1));
							} else {
								bufstrwriter.write(annexpr.toJava(0));
							}
							bufstrwriter.write(" ");
						}
					}
					
					if(meth.varproc.getVarFinal(new VarVersionPaar(index, 0)) == VarTypeProcessor.VAR_FINALEXPLICIT) {
						bufstrwriter.write("final ");
					}

					
					if(descriptor != null) {
						GenericType partype = descriptor.params.get(i);

						boolean isVarArgs = (i == lastparam_index && (mt.getAccessFlags() & CodeConstants.ACC_VARARGS) != 0
								&& partype.arraydim > 0);

						if(isVarArgs) {
							partype.arraydim--;
						}						
						
						String strpartype = GenericMain.getGenericCastTypeName(partype);
						if(ExprProcessor.UNDEFINED_TYPE_STRING.equals(strpartype) && 
								DecompilerContext.getOption(IFernflowerPreferences.UNDEFINED_PARAM_TYPE_OBJECT)) {
							strpartype = ExprProcessor.getCastTypeName(VarType.VARTYPE_OBJECT);
						}

						bufstrwriter.write(strpartype);
						
						if(isVarArgs) {
							bufstrwriter.write(" ...");
						}
						
					} else {
						VarType partype = md.params[i].copy();
						
						boolean isVarArgs = (i == lastparam_index && (mt.getAccessFlags() & CodeConstants.ACC_VARARGS) != 0
								&& partype.arraydim > 0);
						
						if(isVarArgs) {
							partype.decArrayDim();
						}						
						
						String strpartype = ExprProcessor.getCastTypeName(partype);
						if(ExprProcessor.UNDEFINED_TYPE_STRING.equals(strpartype) && 
								DecompilerContext.getOption(IFernflowerPreferences.UNDEFINED_PARAM_TYPE_OBJECT)) {
							strpartype = ExprProcessor.getCastTypeName(VarType.VARTYPE_OBJECT);
						}

						bufstrwriter.write(strpartype);
						
						if(isVarArgs) {
							bufstrwriter.write(" ...");
						}
					}
					
					bufstrwriter.write(" ");
					String parname = meth.varproc.getVarName(new VarVersionPaar(index, 0));
					bufstrwriter.write(parname==null?"param"+index:parname); // null iff decompiled with errors
					firstpar = false;
					param_count_explicit++;
				}
				
				index+=md.params[i].stack_size;
			}
			
			bufstrwriter.write(")");
			
			StructExceptionsAttribute attr = (StructExceptionsAttribute)mt.getAttributes().getWithKey("Exceptions");
			if((descriptor!=null && !descriptor.exceptions.isEmpty()) || attr != null) {
				throwsExceptions = true;
				bufstrwriter.write(" throws ");
				
				for(int i=0;i<attr.getThrowsExceptions().size();i++) {
					if(i>0) {
						bufstrwriter.write(", ");
					}
					if(descriptor!=null && !descriptor.exceptions.isEmpty()) {
						bufstrwriter.write(GenericMain.getGenericCastTypeName(descriptor.exceptions.get(i)));
					} else {
						VarType exctype = new VarType(attr.getExcClassname(i, cl.getPool()), true);
						bufstrwriter.write(ExprProcessor.getCastTypeName(exctype));
					}
				}
			} 
		}
		
		boolean hidemethod = false;
		
		if((flags & (CodeConstants.ACC_ABSTRACT | CodeConstants.ACC_NATIVE)) != 0) { // native or abstract method (explicit or interface)
			if(isAnnotation) {
				StructAnnDefaultAttribute attr = (StructAnnDefaultAttribute)mt.getAttributes().getWithKey("AnnotationDefault");
				if(attr != null) {
					bufstrwriter.write(" default ");
					bufstrwriter.write(attr.getDefaultValue().toJava(indent+1));
				}
			}
			
			bufstrwriter.write(";");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		} else {
			if(!clinit && !dinit) {
				bufstrwriter.write(" ");
			}
			bufstrwriter.write("{");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
			
			RootStatement root = wrapper.getMethodWrapper(mt.getName(), mt.getDescriptor()).root;
			
			if(root != null && !meth.decompiledWithErrors) { // check for existence 
				try {
					String code = root.toJava(indent+1);

					boolean singleinit = false;
					if(init && param_count_explicit == 0 && !throwsExceptions && DecompilerContext.getOption(IFernflowerPreferences.HIDE_DEFAULT_CONSTRUCTOR)) {
						int init_counter = 0; 
						for(MethodWrapper mth : wrapper.getMethods()) {
							if("<init>".equals(mth.methodStruct.getName())) {
								init_counter++;
							}
						}
						singleinit = (init_counter == 1);
					}

					hidemethod = (clinit || dinit || singleinit) && code.length() == 0;

					bufstrwriter.write(code);
				} catch(Throwable ex) {
					DecompilerContext.getLogger().writeMessage("Method "+mt.getName()+" "+mt.getDescriptor()+" couldn't be written.", ex);
					meth.decompiledWithErrors = true;
				}
			} 
			
			if(meth.decompiledWithErrors) {
				bufstrwriter.write(InterpreterUtil.getIndentString(indent+1));
				bufstrwriter.write("// $FF: Couldn't be decompiled");
				bufstrwriter.write(DecompilerContext.getNewLineSeparator());
			}
			
			bufstrwriter.write(indstr+"}");
			bufstrwriter.write(DecompilerContext.getNewLineSeparator());
		}
		
		bufstrwriter.flush();
		
		if(!hidemethod) {
			writer.write(strwriter.toString());
		}
		
		DecompilerContext.setProperty(DecompilerContext.CURRENT_METHOD_WRAPPER, methold);
		
		return !hidemethod;
	}
	
	private List<AnnotationExprent> getAllAnnotations(VBStyleCollection<StructGeneralAttribute, String> attributes) {
		
		String[] annattrnames = new String[] {StructGeneralAttribute.ATTRIBUTE_RUNTIME_VISIBLE_ANNOTATIONS, 
				StructGeneralAttribute.ATTRIBUTE_RUNTIME_INVISIBLE_ANNOTATIONS};	
		
		List<AnnotationExprent> lst = new ArrayList<AnnotationExprent>();
		
		for(String attrname : annattrnames) {
			StructAnnotationAttribute attr = (StructAnnotationAttribute)attributes.getWithKey(attrname);
			if(attr != null) {
				lst.addAll(attr.getAnnotations());
			}
		}
		
		return lst;
	}
	
	private List<List<AnnotationExprent>> getAllParameterAnnotations(VBStyleCollection<StructGeneralAttribute, String> attributes) {
		
		String[] annattrnames = new String[] {StructGeneralAttribute.ATTRIBUTE_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS, 
				StructGeneralAttribute.ATTRIBUTE_RUNTIME_INVISIBLE_PARAMETER_ANNOTATIONS};	
		
		List<List<AnnotationExprent>> ret = new ArrayList<List<AnnotationExprent>>();
		
		for(String attrname : annattrnames) {
			StructAnnotationParameterAttribute attr = (StructAnnotationParameterAttribute)attributes.getWithKey(attrname);
			if(attr != null) {
				for(int i=0;i<attr.getParamAnnotations().size();i++) {
					List<AnnotationExprent> lst = new ArrayList<AnnotationExprent>();
					boolean isnew = (ret.size()<=i); 
					
					if(!isnew) {
						lst = ret.get(i);
					}
					lst.addAll(attr.getParamAnnotations().get(i));
					
					if(isnew) {
						ret.add(lst);
					} else {
						ret.set(i, lst);
					}
				}
			}
		}
		
		return ret;
	}
	
	private String getDescriptorPrintOut(String descriptor, int element) {
	
		switch(element) {
		case 0: // class
			return ExprProcessor.buildJavaClassName(descriptor);
		case 1: // field
			return getTypePrintOut(FieldDescriptor.parseDescriptor(descriptor).type);
		case 2: // method
		default:
			MethodDescriptor md = MethodDescriptor.parseDescriptor(descriptor);
			
			StringBuilder buffer = new StringBuilder("(");
			
			boolean first = true;
			for(VarType partype : md.params) {
				if(first) {
					first = false;
				} else {
					buffer.append(", ");
				}
				buffer.append(getTypePrintOut(partype));
			}
			buffer.append(") ");
			buffer.append(getTypePrintOut(md.ret));
			
			return buffer.toString();
		}
	}
	
	private String getTypePrintOut(VarType type) {
		String strtype = ExprProcessor.getCastTypeName(type, false);
		if(ExprProcessor.UNDEFINED_TYPE_STRING.equals(strtype) && 
				DecompilerContext.getOption(IFernflowerPreferences.UNDEFINED_PARAM_TYPE_OBJECT)) {
			strtype = ExprProcessor.getCastTypeName(VarType.VARTYPE_OBJECT, false);
		}
		return strtype;
	}
}