Initial commit from SVN.
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wcrisman
264
Class File Services/src/com/de22/javabytecode/Method.java
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264
Class File Services/src/com/de22/javabytecode/Method.java
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package com.de22.javabytecode;
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import java.io.IOException;
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import com.common.util.*;
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import com.de22.javabytecode.constant.*;
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/**
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* Copyright Wynne Crisman 1999,2006<p>
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*/
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public class Method extends Component {
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private short accessFlags = 0; //The modifiers and visibility for the method.//
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private short nameIndex = 0; //The index within the constant collection of the name constant for this method.//
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private short descriptorIndex = 0; //The index within the constant collection of the descriptor for this method.//
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private IList attributes = new LiteList(10, 30); //The attributes associated with this method.//
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/**
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* Gets the return type in class file format (ie: [I for int[] and Ljava.lang.Object; for java.lang.Object).
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* @param descriptor The descriptor in class file format.
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* @return The return type in class file format.
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*/
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public static String getReturnType(String descriptor) {
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return descriptor.substring(descriptor.lastIndexOf(')') + 1);
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}//getReturnType()//
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/**
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* Gets the method parameters in class file format (ie: [I for int[] and Ljava.lang.Object; for java.lang.Object).
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* @param descriptor The descriptor in class file format.
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* @return The collection of parameters in order and in class file format.
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*/
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public static String[] getParamterTypes(String descriptor) {
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int descriptorIndex = 1;
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int parameterIndex = 0;
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String[] result = null;
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int startIndex = 1;
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//First count the parameters.//
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while(descriptor.charAt(descriptorIndex) != ')') {
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if(descriptor.charAt(descriptorIndex) == 'L') {
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descriptorIndex = descriptor.indexOf(';', descriptorIndex);
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parameterIndex++;
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}//if//
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else if(descriptor.charAt(descriptorIndex) != '[') {
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parameterIndex++;
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}//else if//
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descriptorIndex++;
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}//while//
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result = new String[parameterIndex];
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parameterIndex = 0;
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descriptorIndex = 1;
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//Next load the parameter class names.//
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while(descriptor.charAt(descriptorIndex) != ')') {
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if(descriptor.charAt(descriptorIndex) == 'L') {
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descriptorIndex = descriptor.indexOf(';', descriptorIndex);
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result[parameterIndex++] = descriptor.substring(startIndex, descriptorIndex + 1);
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startIndex = descriptorIndex + 1;
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}//if//
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else if(descriptor.charAt(descriptorIndex) != '[') {
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result[parameterIndex++] = descriptor.substring(startIndex, descriptorIndex + 1);
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startIndex = descriptorIndex + 1;
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}//else if//
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descriptorIndex++;
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}//while//
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return result;
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}//getParamterTypes()//
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/**
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* Method constructor.
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*/
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protected Method(Type type) {
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super(type);
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}//Method()//
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/**
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* Adds an attribute to the method.
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* An attribute describes some property of the method.
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* @param attribute The attribute to add to the method. The attribute's name will automatically be added to the constant pool.
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* @return The index of the attribute in the attribute pool.
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*/
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public short addAttribute(CodeAttribute attribute) {
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short nameIndex = getType().addConstant(new ConstantUtf8(getType(), attribute.getDefaultName()), false);
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attribute.setNameIndex(nameIndex);
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attributes.add(attribute);
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return (short) (attributes.getSize() - 1);
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}//addAttribute()//
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/**
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* Gets the attribute referenced by the index.
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* <p>Warning: This is a one based index, but the method to get the count will return the actual number of values.</p>
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* @param index The one based index of the attribute to retrieve.
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* @return The attribute at the index. An array index out of bounds exception will be thrown if there is not an attribute at that index.
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*/
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public CodeAttribute getAttribute(short index) {
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int constant = index - 1;
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return (CodeAttribute) attributes.get(constant);
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}//getAttribute()//
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/**
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* Removes the attribute referenced by the index.
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* <p>Warning: This is a one based index, but the method to get the count will return the actual number of values.</p>
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* @param index The one based index of the attribute to remove.
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* @return The attribute at the index. An array index out of bounds exception will be thrown if there is not an attribute at that index.
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*/
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public CodeAttribute removeAttribute(short index) {
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int constant = index - 1;
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return (CodeAttribute) attributes.remove(constant);
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}//getAttribute()//
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/**
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* Gets the count of attributes associated with the type.
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* @return The number of attributes for this type.
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*/
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public int getAttributeCount() {
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return attributes.getSize();
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}//getAttributeCount()//
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/**
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* Gets the method's access flags.
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* @return The method's access flags.
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* @see #ACC_PUBLIC
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* @see #ACC_PRIVATE
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* @see #ACC_PROTECTED
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* @see #ACC_STATIC
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* @see #ACC_ABSTRACT
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* @see #ACC_SYNCHRONIZED
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* @see #ACC_NATIVE
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* @see #ACC_FINAL
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*/
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public short getAccessFlags() {
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return accessFlags;
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}//getAccessFlags()//
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/**
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* Gets the index of constant in the classes constant pool for the method descriptor.
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* @return The method descriptor's constant pool index.
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*/
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public short getDescriptorIndex() {
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return descriptorIndex;
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}//getDescriptorIndex()//
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/**
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* Gets the index of constant in the classes constant pool for the method name.
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* @return The methods name's constant pool index.
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*/
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public short getNameIndex() {
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return nameIndex;
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}//getNameIndex()//
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/**
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* Gets the size in number of bytes of the component and all subcomponents.
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* @return The number of bytes required to represent the component and all subcomponents.
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*/
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public int getSize() {
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return 0;
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}//getSize()//
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/**
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* Reads this object from the given stream.
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* @param in The input stream to read this object from.
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*/
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public void readExternal(java.io.ObjectInput in) throws IOException, ClassNotFoundException {
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short length;
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accessFlags = in.readShort();
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nameIndex = in.readShort();
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descriptorIndex = in.readShort();
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length = in.readShort();
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attributes = length > 0 ? new LiteList((int) length, 10) : LiteList.EMPTY_LIST;
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while(length-- > 0) {
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addAttribute(CodeAttribute.readAttribute(getType(), in));
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}//while//
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}//readExternal()//
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/**
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* Reads a method from the given stream.
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* @param type The type object that the method will belong to.
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* @param in The input stream to read the method from.
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*/
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protected static Method readMethod(Type type, java.io.ObjectInput in) throws java.io.IOException, ClassNotFoundException {
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Method method = new Method(type);
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method.readExternal(in);
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return method;
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}//readMethod()//
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/**
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* Sets the method's access flags.
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* @param accessFlags The method's access flags.
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* @see #ACC_PUBLIC
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* @see #ACC_PRIVATE
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* @see #ACC_PROTECTED
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* @see #ACC_STATIC
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* @see #ACC_ABSTRACT
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* @see #ACC_SYNCHRONIZED
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* @see #ACC_NATIVE
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* @see #ACC_FINAL
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*/
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public void setAccessFlags(short accessFlags) {
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this.accessFlags = accessFlags;
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}//setAccessFlags()//
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/**
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* Sets the index of constant in the classes constant pool for the method descriptor.
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* @param descriptorIndex The method descriptor's constant pool index.
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*/
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public void setDescriptorIndex(short descriptorIndex) {
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this.descriptorIndex = descriptorIndex;
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}//setDescriptorIndex()//
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/**
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* Sets the index of constant in the classes constant pool for the method name.
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* @param nameIndex The methods name's constant pool index.
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*/
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public void setNameIndex(short nameIndex) {
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this.nameIndex = nameIndex;
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}//setNameIndex()//
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/**
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* @see Component.toString(StringBuffer, int)
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*/
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public void toString(StringBuffer buffer, int tabCount) {
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IIterator iterator = null;
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appendTabs(buffer, tabCount);
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buffer.append("Method (accessFlags=");
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buffer.append(accessFlags);
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buffer.append(" nameIndex=");
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buffer.append(nameIndex);
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buffer.append(" descriptorIndex=");
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buffer.append(descriptorIndex);
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buffer.append(" Name='");
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buffer.append(getType().getConstant(nameIndex));
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buffer.append("' Signature='");
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buffer.append(getType().getConstant(descriptorIndex));
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buffer.append("')");
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if(attributes.getSize() > 0) {
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buffer.append(' ');
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buffer.append('{');
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appendEndOfLine(buffer);
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iterator = attributes.iterator();
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while(iterator.hasNext()) {
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CodeAttribute attribute = (CodeAttribute) iterator.next();
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attribute.toString(buffer, tabCount + 1);
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}//while//
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appendTabs(buffer, tabCount);
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buffer.append('}');
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}//if//
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appendEndOfLine(buffer);
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}//toString()//
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/**
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* Writes this object to the given stream.
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* @param out The output stream to write this object to.
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*/
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public void writeExternal(java.io.ObjectOutput out) throws IOException {
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short length = (short) (attributes != null ? attributes.getSize() : 0);
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out.writeShort(accessFlags);
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out.writeShort(nameIndex);
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out.writeShort(descriptorIndex);
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out.writeShort(length);
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for(int index = 0; index < length; index++) {
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((CodeAttribute) attributes.get(index)).writeExternal(out);
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}//for//
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}//writeExternal()//
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}//Method//
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