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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.io.InputStream;
import java.util.HashMap;
public class LazyLoader {
private HashMap<String, Link> mapClassLinks = new HashMap<String, Link>();
private 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;
}
in.skip(8);
return new ConstantPool(in);
}
catch (IOException ex) {
throw new RuntimeException(ex);
}
}
public byte[] loadBytecode(StructMethod mt, int code_fulllength) {
try {
DataInputFullStream in = getClassStream(mt.getClassStruct().qualifiedName);
if (in == null) {
return null;
}
byte[] res = null;
in.skip(8);
ConstantPool pool = mt.getClassStruct().getPool();
if (pool == null) {
pool = new ConstantPool(in);
}
else {
ConstantPool.skipPool(in);
}
in.skip(2);
int this_class = in.readUnsignedShort();
in.skip(2);
// interfaces
in.skip(in.readUnsignedShort() * 2);
// fields
int size = in.readUnsignedShort();
for (int i = 0; i < size; i++) {
in.skip(6);
skipAttributes(in);
}
// methods
size = in.readUnsignedShort();
for (int i = 0; i < size; i++) {
in.skip(2);
int name_index = in.readUnsignedShort();
int descriptor_index = in.readUnsignedShort();
String elem_arr[] = pool.getClassElement(ConstantPool.METHOD, this_class, name_index, descriptor_index);
String name = elem_arr[0];
if (mt.getName().equals(name)) {
String descriptor = elem_arr[1];
if (mt.getDescriptor().equals(descriptor)) {
int len = in.readUnsignedShort();
for (int j = 0; j < len; j++) {
int attr_nameindex = in.readUnsignedShort();
String attrname = pool.getPrimitiveConstant(attr_nameindex).getString();
if (StructGeneralAttribute.ATTRIBUTE_CODE.equals(attrname)) {
in.skip(12);
res = new byte[code_fulllength];
in.readFull(res);
return res;
}
else {
in.skip(in.readInt());
}
}
return null;
}
}
skipAttributes(in);
}
return null;
}
catch (IOException ex) {
throw new RuntimeException(ex);
}
}
public DataInputFullStream getClassStream(String externPath, String internPath) throws IOException {
InputStream instream = provider.getBytecodeStream(externPath, internPath);
return instream == null ? null : new DataInputFullStream(instream);
}
public DataInputFullStream getClassStream(String qualifiedClassName) throws IOException {
Link link = mapClassLinks.get(qualifiedClassName);
return link == null ? null : getClassStream(link.externPath, link.internPath);
}
private void skipAttributes(DataInputFullStream in) throws IOException {
int length = in.readUnsignedShort();
for (int i = 0; i < length; i++) {
in.skip(2);
in.skip(in.readInt());
}
}
public static class Link {
public static final int CLASS = 1;
public static final int ENTRY = 2;
public int type;
public String externPath;
public String internPath;
public Link(int type, String externPath, String internPath) {
this.type = type;
this.externPath = externPath;
this.internPath = internPath;
}
}
}
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