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/*
 * 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:
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 *    notice, this list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
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 *    this software without specific prior written permission.
 *
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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, Eric Bruneton
/** * 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.
/** * Builder used to construct the signature. */
private final StringBuilder buf = new StringBuilder();
Indicates if the signature contains formal type parameters.
/** * Indicates if the signature contains formal type parameters. */
private boolean hasFormals;
Indicates if the signature contains method parameter types.
/** * 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.
/** * 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 SignatureWriter object.
/** * Constructs a new {@link SignatureWriter} object. */
public SignatureWriter() { super(Opcodes.ASM5); } // ------------------------------------------------------------------------ // 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.
Returns:the signature that was built by this signature writer.
/** * 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.
/** * 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.
/** * Ends the type arguments of a class or inner class type. */
private void endArguments() { if (argumentStack % 2 != 0) { buf.append('>'); } argumentStack /= 2; } }