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	/*
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This file is available under and governed by the GNU General Public
	* License version 2 only, as published by the Free Software Foundation.
	* However, the following notice accompanied the original version of this
	* file:
	*
	* ASM: a very small and fast Java bytecode manipulation framework
	* Copyright (c) 2000-2011 INRIA, France Telecom
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the copyright holders nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package jdk.internal.org.objectweb.asm.signature;

	import jdk.internal.org.objectweb.asm.Opcodes;

	/**
	* A signature visitor that generates signatures in string format.
	*
	* @author Thomas Hallgren
	* @author Eric Bruneton
	*/
	public class SignatureWriter extends SignatureVisitor {

	/**
	* Builder used to construct the signature.
	*/
	private final StringBuilder buf = new StringBuilder();

	/**
	* Indicates if the signature contains formal type parameters.
	*/
	private boolean hasFormals;

	/**
	* Indicates if the signature contains method parameter types.
	*/
	private boolean hasParameters;

	/**
	* Stack used to keep track of class types that have arguments. Each element
	* of this stack is a boolean encoded in one bit. The top of the stack is
	* the lowest order bit. Pushing false = 2, pushing true = 2+1, popping =
	* /2.
	*/
	private int argumentStack;

	/**
	* Constructs a new {@link SignatureWriter} object.
	*/
	public SignatureWriter() {
	super(Opcodes.ASM6);
	}

	// ------------------------------------------------------------------------
	// Implementation of the SignatureVisitor interface
	// ------------------------------------------------------------------------

	@Override
	public void visitFormalTypeParameter(final String name) {
	if (!hasFormals) {
	hasFormals = true;
	buf.append('<');
	}
	buf.append(name);
	buf.append(':');
	}

	@Override
	public SignatureVisitor visitClassBound() {
	return this;
	}

	@Override
	public SignatureVisitor visitInterfaceBound() {
	buf.append(':');
	return this;
	}

	@Override
	public SignatureVisitor visitSuperclass() {
	endFormals();
	return this;
	}

	@Override
	public SignatureVisitor visitInterface() {
	return this;
	}

	@Override
	public SignatureVisitor visitParameterType() {
	endFormals();
	if (!hasParameters) {
	hasParameters = true;
	buf.append('(');
	}
	return this;
	}

	@Override
	public SignatureVisitor visitReturnType() {
	endFormals();
	if (!hasParameters) {
	buf.append('(');
	}
	buf.append(')');
	return this;
	}

	@Override
	public SignatureVisitor visitExceptionType() {
	buf.append('^');
	return this;
	}

	@Override
	public void visitBaseType(final char descriptor) {
	buf.append(descriptor);
	}

	@Override
	public void visitTypeVariable(final String name) {
	buf.append('T');
	buf.append(name);
	buf.append(';');
	}

	@Override
	public SignatureVisitor visitArrayType() {
	buf.append('[');
	return this;
	}

	@Override
	public void visitClassType(final String name) {
	buf.append('L');
	buf.append(name);
	argumentStack *= 2;
	}

	@Override
	public void visitInnerClassType(final String name) {
	endArguments();
	buf.append('.');
	buf.append(name);
	argumentStack *= 2;
	}

	@Override
	public void visitTypeArgument() {
	if (argumentStack % 2 == 0) {
	++argumentStack;
	buf.append('<');
	}
	buf.append('*');
	}

	@Override
	public SignatureVisitor visitTypeArgument(final char wildcard) {
	if (argumentStack % 2 == 0) {
	++argumentStack;
	buf.append('<');
	}
	if (wildcard != '=') {
	buf.append(wildcard);
	}
	return this;
	}

	@Override
	public void visitEnd() {
	endArguments();
	buf.append(';');
	}

	/**
	* Returns the signature that was built by this signature writer.
	*
	* @return the signature that was built by this signature writer.
	*/
	@Override
	public String toString() {
	return buf.toString();
	}

	// ------------------------------------------------------------------------
	// Utility methods
	// ------------------------------------------------------------------------

	/**
	* Ends the formal type parameters section of the signature.
	*/
	private void endFormals() {
	if (hasFormals) {
	hasFormals = false;
	buf.append('>');
	}
	}

	/**
	* Ends the type arguments of a class or inner class type.
	*/
	private void endArguments() {
	if (argumentStack % 2 != 0) {
	buf.append('>');
	}
	argumentStack /= 2;
	}
	}

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