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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2004 Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.bytecode;
import java.util.Map;
import java.io.IOException;
import java.io.DataInputStream;
import java.io.ByteArrayOutputStream;
import javassist.bytecode.AnnotationsAttribute.Copier;
import javassist.bytecode.AnnotationsAttribute.Parser;
import javassist.bytecode.annotation.*;
/**
* A class representing <code>RuntimeVisibleAnnotations_attribute</code> and
* <code>RuntimeInvisibleAnnotations_attribute</code>.
*
* <p>To obtain an ParameterAnnotationAttribute object, invoke
* <code>getAttribute(ParameterAnnotationsAttribute.invisibleTag)</code>
* in <code>MethodInfo</code>.
* The obtained attribute is a
* runtime invisible annotations attribute.
* If the parameter is
* <code>ParameterAnnotationAttribute.visibleTag</code>, then the obtained
* attribute is a runtime visible one.
*/
public class ParameterAnnotationsAttribute extends AttributeInfo {
/**
* The name of the <code>RuntimeVisibleParameterAnnotations</code>
* attribute.
*/
public static final String visibleTag
= "RuntimeVisibleParameterAnnotations";
/**
* The name of the <code>RuntimeInvisibleParameterAnnotations</code>
* attribute.
*/
public static final String invisibleTag
= "RuntimeInvisibleParameterAnnotations";
/**
* Constructs
* a <code>Runtime(In)VisisbleParameterAnnotations_attribute</code>.
*
* @param cp constant pool
* @param attrname attribute name (<code>visibleTag</code> or
* <code>invisibleTag</code>).
* @param info the contents of this attribute. It does not
* include <code>attribute_name_index</code> or
* <code>attribute_length</code>.
*/
public ParameterAnnotationsAttribute(ConstPool cp, String attrname,
byte[] info) {
super(cp, attrname, info);
}
/**
* Constructs an empty
* <code>Runtime(In)VisisbleParameterAnnotations_attribute</code>.
* A new annotation can be later added to the created attribute
* by <code>setAnnotations()</code>.
*
* @param cp constant pool
* @param attrname attribute name (<code>visibleTag</code> or
* <code>invisibleTag</code>).
* @see #setAnnotations(Annotation[][])
*/
public ParameterAnnotationsAttribute(ConstPool cp, String attrname) {
this(cp, attrname, new byte[] { 0 });
}
/**
* @param n the attribute name.
*/
ParameterAnnotationsAttribute(ConstPool cp, int n, DataInputStream in)
throws IOException
{
super(cp, n, in);
}
/**
* Returns <code>num_parameters</code>.
*/
public int numParameters() {
return info[0] & 0xff;
}
/**
* Copies this attribute and returns a new copy.
*/
public AttributeInfo copy(ConstPool newCp, Map classnames) {
Copier copier = new Copier(info, constPool, newCp, classnames);
try {
copier.parameters();
return new ParameterAnnotationsAttribute(newCp, getName(),
copier.close());
}
catch (Exception e) {
throw new RuntimeException(e.toString());
}
}
/**
* Parses the annotations and returns a data structure representing
* that parsed annotations. Note that changes of the node values of the
* returned tree are not reflected on the annotations represented by
* this object unless the tree is copied back to this object by
* <code>setAnnotations()</code>.
*
* @return Each element of the returned array represents an array of
* annotations that are associated with each method parameter.
*
* @see #setAnnotations(Annotation[][])
*/
public Annotation[][] getAnnotations() {
try {
return new Parser(info, constPool).parseParameters();
}
catch (Exception e) {
throw new RuntimeException(e.toString());
}
}
/**
* Changes the annotations represented by this object according to
* the given array of <code>Annotation</code> objects.
*
* @param params the data structure representing the
* new annotations. Every element of this array
* is an array of <code>Annotation</code> and
* it represens annotations of each method parameter.
*/
public void setAnnotations(Annotation[][] params) {
ByteArrayOutputStream output = new ByteArrayOutputStream();
AnnotationsWriter writer = new AnnotationsWriter(output, constPool);
try {
int n = params.length;
writer.numParameters(n);
for (int i = 0; i < n; ++i) {
Annotation[] anno = params[i];
writer.numAnnotations(anno.length);
for (int j = 0; j < anno.length; ++j)
anno[j].write(writer);
}
writer.close();
}
catch (IOException e) {
throw new RuntimeException(e); // should never reach here.
}
set(output.toByteArray());
}
}
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