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/*******************************************************************************
* Copyright (c) 2009, 2010 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.p2.internal.repository.comparator.java;
public class ConstantPool extends ClassFileStruct {
private int constantPoolCount;
private int[] constantPoolOffset;
private byte[] classFileBytes;
ConstantPool(byte[] reference, int[] constantPoolOffset) {
this.constantPoolCount = constantPoolOffset.length;
this.constantPoolOffset = constantPoolOffset;
this.classFileBytes = reference;
}
/*
* @see IConstantPool#decodeEntry(int)
*/
public ConstantPoolEntry decodeEntry(int index) {
ConstantPoolEntry constantPoolEntry = new ConstantPoolEntry();
constantPoolEntry.reset();
int kind = getEntryKind(index);
constantPoolEntry.setKind(kind);
switch (kind) {
case ConstantPoolConstant.CONSTANT_Class :
constantPoolEntry.setClassInfoNameIndex(u2At(this.classFileBytes, 1, this.constantPoolOffset[index]));
constantPoolEntry.setClassInfoName(getUtf8ValueAt(constantPoolEntry.getClassInfoNameIndex()));
break;
case ConstantPoolConstant.CONSTANT_Double :
constantPoolEntry.setDoubleValue(doubleAt(this.classFileBytes, 1, this.constantPoolOffset[index]));
break;
case ConstantPoolConstant.CONSTANT_Fieldref :
constantPoolEntry.setClassIndex(u2At(this.classFileBytes, 1, this.constantPoolOffset[index]));
int declaringClassIndex = u2At(this.classFileBytes, 1, this.constantPoolOffset[constantPoolEntry.getClassIndex()]);
constantPoolEntry.setClassName(getUtf8ValueAt(declaringClassIndex));
constantPoolEntry.setNameAndTypeIndex(u2At(this.classFileBytes, 3, this.constantPoolOffset[index]));
int fieldNameIndex = u2At(this.classFileBytes, 1, this.constantPoolOffset[constantPoolEntry.getNameAndTypeIndex()]);
int fieldDescriptorIndex = u2At(this.classFileBytes, 3, this.constantPoolOffset[constantPoolEntry.getNameAndTypeIndex()]);
constantPoolEntry.setFieldName(getUtf8ValueAt(fieldNameIndex));
constantPoolEntry.setFieldDescriptor(getUtf8ValueAt(fieldDescriptorIndex));
break;
case ConstantPoolConstant.CONSTANT_Methodref :
case ConstantPoolConstant.CONSTANT_InterfaceMethodref :
constantPoolEntry.setClassIndex(u2At(this.classFileBytes, 1, this.constantPoolOffset[index]));
declaringClassIndex = u2At(this.classFileBytes, 1, this.constantPoolOffset[constantPoolEntry.getClassIndex()]);
constantPoolEntry.setClassName(getUtf8ValueAt(declaringClassIndex));
constantPoolEntry.setNameAndTypeIndex(u2At(this.classFileBytes, 3, this.constantPoolOffset[index]));
int methodNameIndex = u2At(this.classFileBytes, 1, this.constantPoolOffset[constantPoolEntry.getNameAndTypeIndex()]);
int methodDescriptorIndex = u2At(this.classFileBytes, 3, this.constantPoolOffset[constantPoolEntry.getNameAndTypeIndex()]);
constantPoolEntry.setMethodName(getUtf8ValueAt(methodNameIndex));
constantPoolEntry.setMethodDescriptor(getUtf8ValueAt(methodDescriptorIndex));
break;
case ConstantPoolConstant.CONSTANT_Float :
constantPoolEntry.setFloatValue(floatAt(this.classFileBytes, 1, this.constantPoolOffset[index]));
break;
case ConstantPoolConstant.CONSTANT_Integer :
constantPoolEntry.setIntegerValue(i4At(this.classFileBytes, 1, this.constantPoolOffset[index]));
break;
case ConstantPoolConstant.CONSTANT_Long :
constantPoolEntry.setLongValue(i8At(this.classFileBytes, 1, this.constantPoolOffset[index]));
break;
case ConstantPoolConstant.CONSTANT_NameAndType :
constantPoolEntry.setNameAndTypeNameIndex(u2At(this.classFileBytes, 1, this.constantPoolOffset[index]));
constantPoolEntry.setNameAndTypeDescriptorIndex(u2At(this.classFileBytes, 3, this.constantPoolOffset[index]));
break;
case ConstantPoolConstant.CONSTANT_String :
constantPoolEntry.setStringIndex(u2At(this.classFileBytes, 1, this.constantPoolOffset[index]));
constantPoolEntry.setStringValue(getUtf8ValueAt(constantPoolEntry.getStringIndex()));
break;
case ConstantPoolConstant.CONSTANT_Utf8 :
constantPoolEntry.setUtf8Length(u2At(this.classFileBytes, 1, this.constantPoolOffset[index]));
constantPoolEntry.setUtf8Value(getUtf8ValueAt(index));
}
return constantPoolEntry;
}
/*
* @see IConstantPool#getConstantPoolCount()
*/
public int getConstantPoolCount() {
return this.constantPoolCount;
}
/*
* @see IConstantPool#getEntryKind(int)
*/
public int getEntryKind(int index) {
return u1At(this.classFileBytes, 0, this.constantPoolOffset[index]);
}
private char[] getUtf8ValueAt(int utf8Index) {
int utf8Offset = this.constantPoolOffset[utf8Index];
return utf8At(this.classFileBytes, 0, utf8Offset + 3, u2At(this.classFileBytes, 0, utf8Offset + 1));
}
}
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