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/*
* Copyright 2000-2014 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.
* 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.jetbrains.java.decompiler.struct.lazy;
import org.jetbrains.java.decompiler.main.extern.IBytecodeProvider;
import org.jetbrains.java.decompiler.struct.StructMethod;
import org.jetbrains.java.decompiler.struct.attr.StructGeneralAttribute;
import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
import org.jetbrains.java.decompiler.util.DataInputFullStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class LazyLoader {
private final Map<String, Link> mapClassLinks = new HashMap<String, Link>();
private final IBytecodeProvider provider;
public LazyLoader(IBytecodeProvider provider) {
this.provider = provider;
}
public void addClassLink(String classname, Link link) {
mapClassLinks.put(classname, link);
}
public void removeClassLink(String classname) {
mapClassLinks.remove(classname);
}
public Link getClassLink(String classname) {
return mapClassLinks.get(classname);
}
public ConstantPool loadPool(String classname) {
try {
DataInputFullStream in = getClassStream(classname);
if (in == null) return null;
try {
in.discard(8);
return new ConstantPool(in);
}
finally {
in.close();
}
}
catch (IOException ex) {
throw new RuntimeException(ex);
}
}
public byte[] loadBytecode(StructMethod mt, int codeFullLength) {
String className = mt.getClassStruct().qualifiedName;
try {
DataInputFullStream in = getClassStream(className);
if (in == null) return null;
try {
in.discard(8);
ConstantPool pool = mt.getClassStruct().getPool();
if (pool == null) {
pool = new ConstantPool(in);
}
else {
ConstantPool.skipPool(in);
}
in.discard(6);
// interfaces
in.discard(in.readUnsignedShort() * 2);
// fields
int size = in.readUnsignedShort();
for (int i = 0; i < size; i++) {
in.discard(6);
skipAttributes(in);
}
// methods
size = in.readUnsignedShort();
for (int i = 0; i < size; i++) {
in.discard(2);
int nameIndex = in.readUnsignedShort();
int descriptorIndex = in.readUnsignedShort();
String[] values = pool.getClassElement(ConstantPool.METHOD, className, nameIndex, descriptorIndex);
if (!mt.getName().equals(values[0]) || !mt.getDescriptor().equals(values[1])) {
skipAttributes(in);
continue;
}
int attrSize = in.readUnsignedShort();
for (int j = 0; j < attrSize; j++) {
int attrNameIndex = in.readUnsignedShort();
String attrName = pool.getPrimitiveConstant(attrNameIndex).getString();
if (!StructGeneralAttribute.ATTRIBUTE_CODE.equals(attrName)) {
in.discard(in.readInt());
continue;
}
in.discard(12);
byte[] code = new byte[codeFullLength];
in.readFull(code);
return code;
}
break;
}
}
finally {
in.close();
}
return null;
}
catch (IOException ex) {
throw new RuntimeException(ex);
}
}
public DataInputFullStream getClassStream(String externalPath, String internalPath) throws IOException {
byte[] bytes = provider.getBytecode(externalPath, internalPath);
return new DataInputFullStream(bytes);
}
public DataInputFullStream getClassStream(String qualifiedClassName) throws IOException {
Link link = mapClassLinks.get(qualifiedClassName);
return link == null ? null : getClassStream(link.externalPath, link.internalPath);
}
public static void skipAttributes(DataInputFullStream in) throws IOException {
int length = in.readUnsignedShort();
for (int i = 0; i < length; i++) {
in.discard(2);
in.discard(in.readInt());
}
}
public static class Link {
public static final int CLASS = 1;
public static final int ENTRY = 2;
public int type;
public String externalPath;
public String internalPath;
public Link(int type, String externalPath, String internalPath) {
this.type = type;
this.externalPath = externalPath;
this.internalPath = internalPath;
}
}
}
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