/*
* Copyright 2001-2002,2004 The Apache Software Foundation
*
* 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.apache.tools.ant.taskdefs.optional.sitraka.bytecode;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.tools.ant.taskdefs.optional.depend.constantpool.ClassCPInfo;
import org.apache.tools.ant.taskdefs.optional.depend.constantpool.ConstantPool;
import org.apache.tools.ant.taskdefs.optional.depend.constantpool.Utf8CPInfo;
import org.apache.tools.ant.taskdefs.optional.sitraka.bytecode.attributes.AttributeInfo;
/**
* Object representing a class.
*
* Information are kept to the strict minimum for JProbe reports so
* that not too many objects are created for a class, otherwise the
* JVM can quickly run out of memory when analyzing a great deal of
* classes and keeping them in memory for global analysis.
*
* @author <a href="sbailliez@imediation.com">Stephane Bailliez</a>
*/
public final class ClassFile {
private MethodInfo[] methods;
private String sourceFile;
private String fullname;
private int access_flags;
public ClassFile(InputStream is) throws IOException {
DataInputStream dis = new DataInputStream(is);
ConstantPool constantPool = new ConstantPool();
/* int magic = */ dis.readInt(); // 0xCAFEBABE
/* int minor = */ dis.readShort();
/* int major = */ dis.readShort();
constantPool.read(dis);
constantPool.resolve();
// class information
access_flags = dis.readShort();
int this_class = dis.readShort();
fullname = ((ClassCPInfo) constantPool.getEntry(this_class)).getClassName().replace('/', '.');
/* int super_class = */ dis.readShort();
// skip interfaces...
int count = dis.readShort();
dis.skipBytes(count * 2); // short
// skip fields...
int numFields = dis.readShort();
for (int i = 0; i < numFields; i++) {
// 3 short: access flags, name index, descriptor index
dis.skip(2 * 3);
// attribute list...
int attributes_count = dis.readUnsignedShort();
for (int j = 0; j < attributes_count; j++) {
dis.skipBytes(2); // skip attr_id (short)
int len = dis.readInt();
dis.skipBytes(len);
}
}
// read methods
int method_count = dis.readShort();
methods = new MethodInfo[method_count];
for (int i = 0; i < method_count; i++) {
methods[i] = new MethodInfo();
methods[i].read(constantPool, dis);
}
// get interesting attributes.
int attributes_count = dis.readUnsignedShort();
for (int j = 0; j < attributes_count; j++) {
int attr_id = dis.readShort();
int len = dis.readInt();
String attr_name = Utils.getUTF8Value(constantPool, attr_id);
if (AttributeInfo.SOURCE_FILE.equals(attr_name)) {
int name_index = dis.readShort();
sourceFile = ((Utf8CPInfo) constantPool.getEntry(name_index)).getValue();
} else {
dis.skipBytes(len);
}
}
}
public int getAccess() {
return access_flags;
}
public String getSourceFile() {
return sourceFile;
}
public MethodInfo[] getMethods() {
return methods;
}
public String getFullName() {
return fullname;
}
public String getName() {
String name = getFullName();
int pos = name.lastIndexOf('.');
if (pos == -1) {
return "";
}
return name.substring(pos + 1);
}
public String getPackage() {
String name = getFullName();
int pos = name.lastIndexOf('.');
if (pos == -1) {
return "";
}
return name.substring(0, pos);
}
}