227 lines
6.1 KiB
Java
227 lines
6.1 KiB
Java
/***
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* ASM: a very small and fast Java bytecode manipulation framework
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* Copyright (c) 2000-2011 INRIA, France Telecom
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.objectweb.asm.signature;
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import org.objectweb.asm.Opcodes;
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/**
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* A signature visitor that generates signatures in string format.
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*
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* @author Thomas Hallgren
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* @author Eric Bruneton
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*/
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public class SignatureWriter extends SignatureVisitor {
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/**
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* Buffer used to construct the signature.
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*/
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private final StringBuffer buf = new StringBuffer();
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/**
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* Indicates if the signature contains formal type parameters.
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*/
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private boolean hasFormals;
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/**
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* Indicates if the signature contains method parameter types.
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*/
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private boolean hasParameters;
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/**
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* Stack used to keep track of class types that have arguments. Each element
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* of this stack is a boolean encoded in one bit. The top of the stack is
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* the lowest order bit. Pushing false = *2, pushing true = *2+1, popping =
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* /2.
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*/
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private int argumentStack;
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/**
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* Constructs a new {@link SignatureWriter} object.
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*/
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public SignatureWriter() {
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super(Opcodes.ASM5);
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}
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// ------------------------------------------------------------------------
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// Implementation of the SignatureVisitor interface
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// ------------------------------------------------------------------------
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@Override
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public void visitFormalTypeParameter(final String name) {
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if (!hasFormals) {
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hasFormals = true;
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buf.append('<');
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}
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buf.append(name);
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buf.append(':');
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}
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@Override
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public SignatureVisitor visitClassBound() {
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return this;
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}
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@Override
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public SignatureVisitor visitInterfaceBound() {
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buf.append(':');
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return this;
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}
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@Override
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public SignatureVisitor visitSuperclass() {
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endFormals();
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return this;
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}
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@Override
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public SignatureVisitor visitInterface() {
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return this;
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}
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@Override
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public SignatureVisitor visitParameterType() {
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endFormals();
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if (!hasParameters) {
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hasParameters = true;
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buf.append('(');
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}
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return this;
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}
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@Override
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public SignatureVisitor visitReturnType() {
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endFormals();
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if (!hasParameters) {
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buf.append('(');
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}
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buf.append(')');
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return this;
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}
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@Override
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public SignatureVisitor visitExceptionType() {
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buf.append('^');
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return this;
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}
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@Override
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public void visitBaseType(final char descriptor) {
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buf.append(descriptor);
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}
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@Override
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public void visitTypeVariable(final String name) {
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buf.append('T');
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buf.append(name);
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buf.append(';');
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}
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@Override
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public SignatureVisitor visitArrayType() {
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buf.append('[');
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return this;
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}
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@Override
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public void visitClassType(final String name) {
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buf.append('L');
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buf.append(name);
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argumentStack *= 2;
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}
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@Override
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public void visitInnerClassType(final String name) {
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endArguments();
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buf.append('.');
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buf.append(name);
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argumentStack *= 2;
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}
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@Override
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public void visitTypeArgument() {
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if (argumentStack % 2 == 0) {
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++argumentStack;
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buf.append('<');
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}
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buf.append('*');
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}
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@Override
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public SignatureVisitor visitTypeArgument(final char wildcard) {
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if (argumentStack % 2 == 0) {
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++argumentStack;
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buf.append('<');
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}
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if (wildcard != '=') {
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buf.append(wildcard);
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}
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return this;
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}
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@Override
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public void visitEnd() {
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endArguments();
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buf.append(';');
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}
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/**
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* Returns the signature that was built by this signature writer.
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*
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* @return the signature that was built by this signature writer.
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*/
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@Override
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public String toString() {
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return buf.toString();
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}
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// ------------------------------------------------------------------------
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// Utility methods
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// ------------------------------------------------------------------------
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/**
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* Ends the formal type parameters section of the signature.
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*/
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private void endFormals() {
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if (hasFormals) {
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hasFormals = false;
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buf.append('>');
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}
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}
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/**
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* Ends the type arguments of a class or inner class type.
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*/
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private void endArguments() {
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if (argumentStack % 2 != 0) {
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buf.append('>');
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}
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argumentStack /= 2;
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}
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} |