org.apache.commons.compress.harmony.unpack200.bytecode.forms.ReferenceForm Maven / Gradle / Ivy
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Apache Commons Compress software defines an API for working with
compression and archive formats. These include: bzip2, gzip, pack200,
lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.compress.harmony.unpack200.bytecode.forms;
import org.apache.commons.compress.harmony.pack200.Pack200Exception;
import org.apache.commons.compress.harmony.unpack200.SegmentConstantPool;
import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode;
import org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry;
import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager;
/**
* Abstract class of all ByteCodeForms which add a nested entry from the globalConstantPool.
*/
public abstract class ReferenceForm extends ByteCodeForm {
public ReferenceForm(final int opcode, final String name, final int[] rewrite) {
super(opcode, name, rewrite);
}
protected abstract int getPoolID();
protected abstract int getOffset(OperandManager operandManager);
protected void setNestedEntries(final ByteCode byteCode, final OperandManager operandManager, final int offset)
throws Pack200Exception {
final SegmentConstantPool globalPool = operandManager.globalConstantPool();
ClassFileEntry[] nested = null;
nested = new ClassFileEntry[] {globalPool.getConstantPoolEntry(getPoolID(), offset)};
if (nested[0] == null) {
throw new NullPointerException("Null nested entries are not allowed");
}
byteCode.setNested(nested);
byteCode.setNestedPositions(new int[][] {{0, 2}});
}
/*
* (non-Javadoc)
*
* @see
* org.apache.commons.compress.harmony.unpack200.bytecode.forms.ByteCodeForm#setByteCodeOperands(org.apache.commons.
* compress.harmony.unpack200.bytecode.ByteCode,
* org.apache.commons.compress.harmony.unpack200.bytecode.OperandTable,
* org.apache.commons.compress.harmony.unpack200.Segment)
*/
@Override
public void setByteCodeOperands(final ByteCode byteCode, final OperandManager operandManager,
final int codeLength) {
final int offset = getOffset(operandManager);
try {
setNestedEntries(byteCode, operandManager, offset);
} catch (final Pack200Exception ex) {
throw new Error("Got a pack200 exception. What to do?");
}
}
}