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	/*
	* reserved comment block
	* DO NOT REMOVE OR ALTER!
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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 com.sun.org.apache.bcel.internal.classfile;

	import java.io.ByteArrayInputStream;
	import java.io.DataInput;
	import java.io.DataOutputStream;
	import java.io.IOException;

	import com.sun.org.apache.bcel.internal.Const;

	/**
	* This class is derived from <em>Attribute</em> and represents a reference
	* to a GJ attribute.
	*
	* @version $Id: Signature.java 1749603 2016-06-21 20:50:19Z ggregory $
	* @see Attribute
	*/
	public final class Signature extends Attribute {

	private int signature_index;


	/**
	* Initialize from another object. Note that both objects use the same
	* references (shallow copy). Use clone() for a physical copy.
	*/
	public Signature(final Signature c) {
	this(c.getNameIndex(), c.getLength(), c.getSignatureIndex(), c.getConstantPool());
	}


	/**
	* Construct object from file stream.
	* @param name_index Index in constant pool to CONSTANT_Utf8
	* @param length Content length in bytes
	* @param input Input stream
	* @param constant_pool Array of constants
	* @throws IOException
	*/
	Signature(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool)
	throws IOException {
	this(name_index, length, input.readUnsignedShort(), constant_pool);
	}


	/**
	* @param name_index Index in constant pool to CONSTANT_Utf8
	* @param length Content length in bytes
	* @param signature_index Index in constant pool to CONSTANT_Utf8
	* @param constant_pool Array of constants
	*/
	public Signature(final int name_index, final int length, final int signature_index, final ConstantPool constant_pool) {
	super(Const.ATTR_SIGNATURE, name_index, length, constant_pool);
	this.signature_index = signature_index;
	}


	/**
	* Called by objects that are traversing the nodes of the tree implicitely
	* defined by the contents of a Java class. I.e., the hierarchy of methods,
	* fields, attributes, etc. spawns a tree of objects.
	*
	* @param v Visitor object
	*/
	@Override
	public void accept( final Visitor v ) {
	//System.err.println("Visiting non-standard Signature object");
	v.visitSignature(this);
	}


	/**
	* Dump source file attribute to file stream in binary format.
	*
	* @param file Output file stream
	* @throws IOException
	*/
	@Override
	public final void dump( final DataOutputStream file ) throws IOException {
	super.dump(file);
	file.writeShort(signature_index);
	}


	/**
	* @return Index in constant pool of source file name.
	*/
	public final int getSignatureIndex() {
	return signature_index;
	}


	/**
	* @param signature_index the index info the constant pool of this signature
	*/
	public final void setSignatureIndex( final int signature_index ) {
	this.signature_index = signature_index;
	}


	/**
	* @return GJ signature.
	*/
	public final String getSignature() {
	final ConstantUtf8 c = (ConstantUtf8) super.getConstantPool().getConstant(signature_index,
	Const.CONSTANT_Utf8);
	return c.getBytes();
	}

	/**
	* Extends ByteArrayInputStream to make 'unreading' chars possible.
	*/
	private static final class MyByteArrayInputStream extends ByteArrayInputStream {

	MyByteArrayInputStream(final String data) {
	super(data.getBytes());
	}


	final String getData() {
	return new String(buf);
	}


	final void unread() {
	if (pos > 0) {
	pos--;
	}
	}
	}


	private static boolean identStart( final int ch ) {
	return ch == 'T' \|\| ch == 'L';
	}


	private static void matchIdent( final MyByteArrayInputStream in, final StringBuilder buf ) {
	int ch;
	if ((ch = in.read()) == -1) {
	throw new RuntimeException("Illegal signature: " + in.getData()
	+ " no ident, reaching EOF");
	}
	//System.out.println("return from ident:" + (char)ch);
	if (!identStart(ch)) {
	final StringBuilder buf2 = new StringBuilder();
	int count = 1;
	while (Character.isJavaIdentifierPart((char) ch)) {
	buf2.append((char) ch);
	count++;
	ch = in.read();
	}
	if (ch == ':') { // Ok, formal parameter
	in.skip("Ljava/lang/Object".length());
	buf.append(buf2);
	ch = in.read();
	in.unread();
	//System.out.println("so far:" + buf2 + ":next:" +(char)ch);
	} else {
	for (int i = 0; i < count; i++) {
	in.unread();
	}
	}
	return;
	}
	final StringBuilder buf2 = new StringBuilder();
	ch = in.read();
	do {
	buf2.append((char) ch);
	ch = in.read();
	//System.out.println("within ident:"+ (char)ch);
	} while ((ch != -1) && (Character.isJavaIdentifierPart((char) ch) \|\| (ch == '/')));
	buf.append(buf2.toString().replace('/', '.'));
	//System.out.println("regular return ident:"+ (char)ch + ":" + buf2);
	if (ch != -1) {
	in.unread();
	}
	}


	private static void matchGJIdent( final MyByteArrayInputStream in, final StringBuilder buf ) {
	int ch;
	matchIdent(in, buf);
	ch = in.read();
	if ((ch == '<') \|\| ch == '(') { // Parameterized or method
	//System.out.println("Enter <");
	buf.append((char) ch);
	matchGJIdent(in, buf);
	while (((ch = in.read()) != '>') && (ch != ')')) { // List of parameters
	if (ch == -1) {
	throw new RuntimeException("Illegal signature: " + in.getData()
	+ " reaching EOF");
	}
	//System.out.println("Still no >");
	buf.append(", ");
	in.unread();
	matchGJIdent(in, buf); // Recursive call
	}
	//System.out.println("Exit >");
	buf.append((char) ch);
	} else {
	in.unread();
	}
	ch = in.read();
	if (identStart(ch)) {
	in.unread();
	matchGJIdent(in, buf);
	} else if (ch == ')') {
	in.unread();
	return;
	} else if (ch != ';') {
	throw new RuntimeException("Illegal signature: " + in.getData() + " read " + (char) ch);
	}
	}


	public static String translate( final String s ) {
	//System.out.println("Sig:" + s);
	final StringBuilder buf = new StringBuilder();
	matchGJIdent(new MyByteArrayInputStream(s), buf);
	return buf.toString();
	}


	// @since 6.0 is no longer final
	public static boolean isFormalParameterList( final String s ) {
	return s.startsWith("<") && (s.indexOf(':') > 0);
	}


	// @since 6.0 is no longer final
	public static boolean isActualParameterList( final String s ) {
	return s.startsWith("L") && s.endsWith(">;");
	}


	/**
	* @return String representation
	*/
	@Override
	public final String toString() {
	final String s = getSignature();
	return "Signature: " + s;
	}


	/**
	* @return deep copy of this attribute
	*/
	@Override
	public Attribute copy( final ConstantPool _constant_pool ) {
	return (Attribute) clone();
	}
	}

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