Cleanup (formatting; minor optimization)

src/org/jetbrains/java/decompiler/struct/consts/ConstantPool.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2015 JetBrains s.r.o.
+ * Copyright 2000-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,20 +27,21 @@ import org.jetbrains.java.decompiler.util.DataInputFullStream;
 import java.io.DataInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.BitSet;
 import java.util.List;
 
+@SuppressWarnings("AssignmentToForLoopParameter")
 public class ConstantPool implements NewClassNameBuilder {
-
   public static final int FIELD = 1;
   public static final int METHOD = 2;
 
-  private final List<PooledConstant> pool = new ArrayList<PooledConstant>();
+  private final List<PooledConstant> pool;
   private final PoolInterceptor interceptor;
 
-
   public ConstantPool(DataInputStream in) throws IOException {
     int size = in.readUnsignedShort();
-    int[] pass = new int[size];
+    pool = new ArrayList<PooledConstant>(size);
+    BitSet[] nextPass = {new BitSet(size), new BitSet(size), new BitSet(size)};
 
     // first dummy constant
     pool.add(null);
@@ -53,54 +54,59 @@ public class ConstantPool implements NewClassNameBuilder {
         case CodeConstants.CONSTANT_Utf8:
           pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Utf8, in.readUTF()));
           break;
+
         case CodeConstants.CONSTANT_Integer:
           pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Integer, new Integer(in.readInt())));
           break;
+
         case CodeConstants.CONSTANT_Float:
           pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Float, new Float(in.readFloat())));
           break;
+
         case CodeConstants.CONSTANT_Long:
           pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Long, new Long(in.readLong())));
           pool.add(null);
           i++;
           break;
+
         case CodeConstants.CONSTANT_Double:
           pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Double, new Double(in.readDouble())));
           pool.add(null);
           i++;
           break;
+
         case CodeConstants.CONSTANT_Class:
         case CodeConstants.CONSTANT_String:
         case CodeConstants.CONSTANT_MethodType:
           pool.add(new PrimitiveConstant(tag, in.readUnsignedShort()));
-          pass[i] = 1;
+          nextPass[0].set(i);
           break;
+
+        case CodeConstants.CONSTANT_NameAndType:
+          pool.add(new LinkConstant(tag, in.readUnsignedShort(), in.readUnsignedShort()));
+          nextPass[0].set(i);
+          break;
+
         case CodeConstants.CONSTANT_Fieldref:
         case CodeConstants.CONSTANT_Methodref:
         case CodeConstants.CONSTANT_InterfaceMethodref:
-        case CodeConstants.CONSTANT_NameAndType:
         case CodeConstants.CONSTANT_InvokeDynamic:
           pool.add(new LinkConstant(tag, in.readUnsignedShort(), in.readUnsignedShort()));
-          if (tag == CodeConstants.CONSTANT_NameAndType) {
-            pass[i] = 1;
-          }
-          else {
-            pass[i] = 2;
-          }
+          nextPass[1].set(i);
           break;
+
         case CodeConstants.CONSTANT_MethodHandle:
           pool.add(new LinkConstant(tag, in.readUnsignedByte(), in.readUnsignedShort()));
-          pass[i] = 3;
+          nextPass[2].set(i);
           break;
       }
     }
 
     // resolving complex pool elements
-    for (int passIndex = 1; passIndex <= 3; passIndex++) {
-      for (int i = 1; i < size; i++) {
-        if (pass[i] == passIndex) {
-          pool.get(i).resolveConstant(this);
-        }
+    for (BitSet pass : nextPass) {
+      int idx = 0;
+      while ((idx = pass.nextSetBit(idx + 1)) > 0) {
+        pool.get(idx).resolveConstant(this);
       }
     }
 
@@ -116,6 +122,7 @@ public class ConstantPool implements NewClassNameBuilder {
         case CodeConstants.CONSTANT_Utf8:
           in.readUTF();
           break;
+
         case CodeConstants.CONSTANT_Integer:
         case CodeConstants.CONSTANT_Float:
         case CodeConstants.CONSTANT_Fieldref:
@@ -125,16 +132,19 @@ public class ConstantPool implements NewClassNameBuilder {
         case CodeConstants.CONSTANT_InvokeDynamic:
           in.discard(4);
           break;
+
         case CodeConstants.CONSTANT_Long:
         case CodeConstants.CONSTANT_Double:
           in.discard(8);
           i++;
           break;
+
         case CodeConstants.CONSTANT_Class:
         case CodeConstants.CONSTANT_String:
         case CodeConstants.CONSTANT_MethodType:
           in.discard(2);
           break;
+
         case CodeConstants.CONSTANT_MethodHandle:
           in.discard(3);
       }
@@ -155,7 +165,7 @@ public class ConstantPool implements NewClassNameBuilder {
         className = oldClassName;
       }
 
-      String newElement = interceptor.getName(className + " " + elementName + " " + descriptor);
+      String newElement = interceptor.getName(className + ' ' + elementName + ' ' + descriptor);
       if (newElement != null) {
         elementName = newElement.split(" ")[1];
       }
@@ -196,7 +206,7 @@ public class ConstantPool implements NewClassNameBuilder {
          ln.type == CodeConstants.CONSTANT_Methodref ||
          ln.type == CodeConstants.CONSTANT_InterfaceMethodref)) {
       String newClassName = buildNewClassname(ln.classname);
-      String newElement = interceptor.getName(ln.classname + " " + ln.elementname + " " + ln.descriptor);
+      String newElement = interceptor.getName(ln.classname + ' ' + ln.elementname + ' ' + ln.descriptor);
       String newDescriptor = buildNewDescriptor(ln.type == CodeConstants.CONSTANT_Fieldref, ln.descriptor);
 
       if (newClassName != null || newElement != null || newDescriptor != null) {
@@ -220,10 +230,10 @@ public class ConstantPool implements NewClassNameBuilder {
 
       if (vt.arrayDim > 0) {
         for (int i = 0; i < vt.arrayDim; i++) {
-          buffer.append("[");
+          buffer.append('[');
         }
 
-        buffer.append("L").append(newName).append(";");
+        buffer.append('L').append(newName).append(';');
       }
       else {
         buffer.append(newName);
@@ -243,4 +253,4 @@ public class ConstantPool implements NewClassNameBuilder {
       return MethodDescriptor.parseDescriptor(descriptor).buildNewDescriptor(this);
     }
   }
-}
+}