Back to index...

	/*
	* 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.DataInput;
	import java.io.IOException;

	import com.sun.org.apache.bcel.internal.Const;
	import com.sun.org.apache.bcel.internal.generic.Type;
	import com.sun.org.apache.bcel.internal.util.BCELComparator;

	/**
	* This class represents the method info structure, i.e., the representation for
	* a method in the class. See JVM specification for details. A method has access
	* flags, a name, a signature and a number of attributes.
	*
	* @version $Id: Method.java 1749603 2016-06-21 20:50:19Z ggregory $
	*/
	public final class Method extends FieldOrMethod {

	private static BCELComparator bcelComparator = new BCELComparator() {

	@Override
	public boolean equals(final Object o1, final Object o2) {
	final Method THIS = (Method) o1;
	final Method THAT = (Method) o2;
	return THIS.getName().equals(THAT.getName())
	&& THIS.getSignature().equals(THAT.getSignature());
	}

	@Override
	public int hashCode(final Object o) {
	final Method THIS = (Method) o;
	return THIS.getSignature().hashCode() ^ THIS.getName().hashCode();
	}
	};

	// annotations defined on the parameters of a method
	private ParameterAnnotationEntry[] parameterAnnotationEntries;

	/**
	* Empty constructor, all attributes have to be defined via `setXXX'
	* methods. Use at your own risk.
	*/
	public Method() {
	}

	/**
	* Initialize from another object. Note that both objects use the same
	* references (shallow copy). Use clone() for a physical copy.
	*/
	public Method(final Method c) {
	super(c);
	}

	/**
	* Construct object from file stream.
	*
	* @param file Input stream
	* @throws IOException
	* @throws ClassFormatException
	*/
	Method(final DataInput file, final ConstantPool constant_pool) throws IOException,
	ClassFormatException {
	super(file, constant_pool);
	}

	/**
	* @param access_flags Access rights of method
	* @param name_index Points to field name in constant pool
	* @param signature_index Points to encoded signature
	* @param attributes Collection of attributes
	* @param constant_pool Array of constants
	*/
	public Method(final int access_flags, final int name_index, final int signature_index, final Attribute[] attributes,
	final ConstantPool constant_pool) {
	super(access_flags, name_index, signature_index, attributes, constant_pool);
	}

	/**
	* 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) {
	v.visitMethod(this);
	}

	/**
	* @return Code attribute of method, if any
	*/
	public final Code getCode() {
	for (final Attribute attribute : super.getAttributes()) {
	if (attribute instanceof Code) {
	return (Code) attribute;
	}
	}
	return null;
	}

	/**
	* @return ExceptionTable attribute of method, if any, i.e., list all
	* exceptions the method may throw not exception handlers!
	*/
	public final ExceptionTable getExceptionTable() {
	for (final Attribute attribute : super.getAttributes()) {
	if (attribute instanceof ExceptionTable) {
	return (ExceptionTable) attribute;
	}
	}
	return null;
	}

	/**
	* @return LocalVariableTable of code attribute if any, i.e. the call is
	* forwarded to the Code atribute.
	*/
	public final LocalVariableTable getLocalVariableTable() {
	final Code code = getCode();
	if (code == null) {
	return null;
	}
	return code.getLocalVariableTable();
	}

	/**
	* @return LineNumberTable of code attribute if any, i.e. the call is
	* forwarded to the Code atribute.
	*/
	public final LineNumberTable getLineNumberTable() {
	final Code code = getCode();
	if (code == null) {
	return null;
	}
	return code.getLineNumberTable();
	}

	/**
	* Return string representation close to declaration format, e.g.
	* 'public static void main(String[] args) throws IOException'
	*
	* @return String representation of the method.
	*/
	@Override
	public final String toString() {
	final String access = Utility.accessToString(super.getAccessFlags());
	// Get name and signature from constant pool
	ConstantUtf8 c = (ConstantUtf8) super.getConstantPool().getConstant(super.getSignatureIndex(), Const.CONSTANT_Utf8);
	String signature = c.getBytes();
	c = (ConstantUtf8) super.getConstantPool().getConstant(super.getNameIndex(), Const.CONSTANT_Utf8);
	final String name = c.getBytes();
	signature = Utility.methodSignatureToString(signature, name, access, true,
	getLocalVariableTable());
	final StringBuilder buf = new StringBuilder(signature);
	for (final Attribute attribute : super.getAttributes()) {
	if (!((attribute instanceof Code) \|\| (attribute instanceof ExceptionTable))) {
	buf.append(" [").append(attribute).append("]");
	}
	}
	final ExceptionTable e = getExceptionTable();
	if (e != null) {
	final String str = e.toString();
	if (!str.isEmpty()) {
	buf.append("\n\t\tthrows ").append(str);
	}
	}
	return buf.toString();
	}

	/**
	* @return deep copy of this method
	*/
	public final Method copy(final ConstantPool _constant_pool) {
	return (Method) copy_(_constant_pool);
	}

	/**
	* @return return type of method
	*/
	public Type getReturnType() {
	return Type.getReturnType(getSignature());
	}

	/**
	* @return array of method argument types
	*/
	public Type[] getArgumentTypes() {
	return Type.getArgumentTypes(getSignature());
	}

	/**
	* @return Comparison strategy object
	*/
	public static BCELComparator getComparator() {
	return bcelComparator;
	}

	/**
	* @param comparator Comparison strategy object
	*/
	public static void setComparator(final BCELComparator comparator) {
	bcelComparator = comparator;
	}

	/**
	* Return value as defined by given BCELComparator strategy. By default two
	* method objects are said to be equal when their names and signatures are
	* equal.
	*
	* @see java.lang.Object#equals(java.lang.Object)
	*/
	@Override
	public boolean equals(final Object obj) {
	return bcelComparator.equals(this, obj);
	}

	/**
	* Return value as defined by given BCELComparator strategy. By default
	* return the hashcode of the method's name XOR signature.
	*
	* @see java.lang.Object#hashCode()
	*/
	@Override
	public int hashCode() {
	return bcelComparator.hashCode(this);
	}

	/**
	* @return Annotations on the parameters of a method
	* @since 6.0
	*/
	public ParameterAnnotationEntry[] getParameterAnnotationEntries() {
	if (parameterAnnotationEntries == null) {
	parameterAnnotationEntries = ParameterAnnotationEntry.createParameterAnnotationEntries(getAttributes());
	}
	return parameterAnnotationEntries;
	}
	}

Back to index...