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/* *******************************************************************
* Copyright (c) 2013 VMware
*
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v 2.0
* which accompanies this distribution and is available at
* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
*
* Contributors:
* Andy Clement initial implementation
* ******************************************************************/
package org.aspectj.apache.bcel.classfile;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.aspectj.apache.bcel.Constants;
// see https://cr.openjdk.java.net/~abuckley/8misc.pdf
public class MethodParameters extends Attribute {
public final static int[] NO_PARAMETER_NAME_INDEXES = new int[0];
public final static int[] NO_PARAMETER_ACCESS_FLAGS = new int[0];
public final static int ACCESS_FLAGS_FINAL = 0x0010;
public final static int ACCESS_FLAGS_SYNTHETIC = 0x1000;
public final static int ACCESS_FLAGS_MANDATED = 0x8000;
// if 'isInPackedState' then this data needs unpacking
private boolean isInPackedState = false;
private byte[] data;
private int[] names;
private int[] accessFlags;
public MethodParameters(int index, int length, DataInputStream dis, ConstantPool cpool) throws IOException {
super(Constants.ATTR_METHOD_PARAMETERS,index,length,cpool);
data = new byte[length];
dis.readFully(data,0,length);
isInPackedState = true;
}
private void ensureInflated() {
if (names!=null) return;
try {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(data));
int parametersCount = dis.readUnsignedByte();
if (parametersCount == 0) {
names = NO_PARAMETER_NAME_INDEXES;
accessFlags = NO_PARAMETER_ACCESS_FLAGS;
} else {
names = new int[parametersCount];
accessFlags = new int[parametersCount];
for (int i=0;i<parametersCount;i++) {
names[i] = dis.readUnsignedShort();
accessFlags[i] = dis.readUnsignedShort();
}
}
isInPackedState = false;
} catch (IOException ioe) {
throw new RuntimeException("Unabled to inflate type annotation data, badly formed?");
}
}
public void dump(DataOutputStream dos) throws IOException {
super.dump(dos);
if (isInPackedState) {
dos.write(data);
} else {
dos.writeByte(names.length);
for (int i=0;i<names.length;i++) {
dos.writeShort(names[i]);
dos.writeShort(accessFlags[i]);
}
}
}
public int getParametersCount() {
ensureInflated();
return names.length;
}
public String getParameterName(int parameter) {
ensureInflated();
ConstantUtf8 c = (ConstantUtf8) cpool.getConstant(names[parameter], Constants.CONSTANT_Utf8);
return c.getValue();
}
public int getAccessFlags(int parameter) {
ensureInflated();
return accessFlags[parameter];
}
public boolean isFinal(int parameter) {
return (getAccessFlags(parameter) & ACCESS_FLAGS_FINAL)!=0;
}
public boolean isSynthetic(int parameter) {
return (getAccessFlags(parameter) & ACCESS_FLAGS_SYNTHETIC)!=0;
}
public boolean isMandated(int parameter) {
return (getAccessFlags(parameter) & ACCESS_FLAGS_MANDATED)!=0;
}
@Override
public void accept(ClassVisitor v) {
v.visitMethodParameters(this);
}
}
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