/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- 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,
 * or the Apache License Version 2.0.
 *
 * 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.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javassist.bytecode.AnnotationsAttribute.Copier;
import javassist.bytecode.AnnotationsAttribute.Parser;
import javassist.bytecode.AnnotationsAttribute.Renamer;
import javassist.bytecode.annotation.Annotation;
import javassist.bytecode.annotation.AnnotationsWriter;

A class representing RuntimeVisibleAnnotations_attribute and
RuntimeInvisibleAnnotations_attribute.
To obtain an ParameterAnnotationAttribute object, invoke
getAttribute(ParameterAnnotationsAttribute.invisibleTag)
in MethodInfo.
The obtained attribute is a
runtime invisible annotations attribute.  
If the parameter is
ParameterAnnotationAttribute.visibleTag, then the obtained
attribute is a runtime visible one.
/**
 * 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 RuntimeVisibleParameterAnnotations
attribute.
/**
     * The name of the <code>RuntimeVisibleParameterAnnotations</code>
     * attribute.
     */
    public static final String visibleTag
        = "RuntimeVisibleParameterAnnotations";

    
The name of the RuntimeInvisibleParameterAnnotations
attribute.
/**
     * The name of the <code>RuntimeInvisibleParameterAnnotations</code>
     * attribute.
     */
    public static final String invisibleTag
        = "RuntimeInvisibleParameterAnnotations";
    
Constructs
a Runtime(In)VisibleParameterAnnotations_attribute.
Params:
cp –            constant pool
attrname –      attribute name (visibleTag or
                     invisibleTag).
info –          the contents of this attribute.  It does not
                     include attribute_name_index or
                     attribute_length./**
     * Constructs
     * a <code>Runtime(In)VisibleParameterAnnotations_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
Runtime(In)VisibleParameterAnnotations_attribute.
A new annotation can be later added to the created attribute
by setAnnotations().
Params:
cp –            constant pool
attrname –      attribute name (visibleTag or
                     invisibleTag).
See Also:
setAnnotations(Annotation[][])/**
     * Constructs an empty
     * <code>Runtime(In)VisibleParameterAnnotations_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 });
    }

    
Params:
n –     the attribute name./**
     * @param n     the attribute name.
     */
    ParameterAnnotationsAttribute(ConstPool cp, int n, DataInputStream in)
        throws IOException
    {
        super(cp, n, in);
    }

    
Returns num_parameters. 
/**
     * Returns <code>num_parameters</code>. 
     */
    public int numParameters() {
        return info[0] & 0xff;
    }

    
Copies this attribute and returns a new copy.
/**
     * Copies this attribute and returns a new copy.
     */
    @Override
    public AttributeInfo copy(ConstPool newCp, Map<String,String> 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
setAnnotations().
See Also:
setAnnotations(Annotation[][])
Returns:
Each element of the returned array represents an array of
annotations that are associated with each method parameter./**
     * 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 Annotation objects.
Params:
params –        the data structure representing the
                     new annotations. Every element of this array
                     is an array of Annotation and
                     it represens annotations of each method parameter./**
     * 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 {
            writer.numParameters(params.length);
            for (Annotation[] anno:params) {
                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());
    }

    
Params:
oldname –       a JVM class name.
newname –       a JVM class name./**
     * @param oldname       a JVM class name.
     * @param newname       a JVM class name.
     */
    @Override
    void renameClass(String oldname, String newname) {
        Map<String,String> map = new HashMap<String,String>();
        map.put(oldname, newname);
        renameClass(map);
    }

    @Override
    void renameClass(Map<String,String> classnames) {
        Renamer renamer = new Renamer(info, getConstPool(), classnames);
        try {
            renamer.parameters();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    void getRefClasses(Map<String,String> classnames) { renameClass(classnames); }

    
Returns a string representation of this object.
/**
     * Returns a string representation of this object.
     */
    @Override
    public String toString() {
        Annotation[][] aa = getAnnotations();
        StringBuilder sbuf = new StringBuilder();
        for (Annotation[] a : aa) {
            for (Annotation i : a)
                sbuf.append(i.toString()).append(" ");

            sbuf.append(", ");
        }

        return sbuf.toString().replaceAll(" (?=,)|, $","");
    }
}