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/*
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*
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* and Distribution License("CDDL") (collectively, the "License"). You
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*
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package com.sun.jdo.api.persistence.enhancer.classfile;
import java.io.*;
import java.util.Vector;
import java.util.Enumeration;
import java.util.NoSuchElementException;
/**
* A list of attributes within a class file.
* These lists occur in several places within a class file
* - at class level
* - at method level
* - at field level
* - at attribute level
*/
public class AttributeVector {
/* Vector of ClassAttribute */
private ClassAttribute attributes[] = null;
/**
* Returns the i'th attribute in the array
*/
private ClassAttribute attrAt(int i) {
return attributes[i];
}
/**
* Construct an empty AttributeVector
*/
public AttributeVector() { }
/**
* Add an element to the vector
*/
public void addElement(ClassAttribute attr) {
if (attributes == null)
attributes = new ClassAttribute[1];
else {
ClassAttribute newAttributes[] = new ClassAttribute[attributes.length+1];
System.arraycopy(attributes, 0, newAttributes, 0, attributes.length);
attributes = newAttributes;
}
attributes[attributes.length-1] = attr;
}
public Enumeration elements() {
class AttributeVectorEnumeration implements Enumeration {
private ClassAttribute[] attributes;
private int current = 0;
AttributeVectorEnumeration(ClassAttribute attrs[]) {
attributes = attrs;
}
public boolean hasMoreElements() {
return attributes != null && current < attributes.length;
}
public Object nextElement() {
if (!hasMoreElements())
throw new NoSuchElementException();
return attributes[current++];
}
}
return new AttributeVectorEnumeration(attributes);
}
/**
* Look for an attribute of a specific name
*/
public ClassAttribute findAttribute(String attrName) {
Enumeration e = elements();
while (e.hasMoreElements()) {
ClassAttribute attr = (ClassAttribute) e.nextElement();
if (attr.attrName().asString().equals(attrName))
return attr;
}
return null;
}
/**
* General attribute reader
*/
static AttributeVector readAttributes(
DataInputStream data, ConstantPool constantPool)
throws IOException {
AttributeVector attribs = new AttributeVector();
int n_attrs = data.readUnsignedShort();
while (n_attrs-- > 0) {
attribs.addElement(ClassAttribute.read(data, constantPool));
}
return attribs;
}
/**
* ClassMethod attribute reader
*/
static AttributeVector readAttributes(
DataInputStream data, CodeEnv codeEnv)
throws IOException {
AttributeVector attribs = new AttributeVector();
int n_attrs = data.readUnsignedShort();
while (n_attrs-- > 0) {
attribs.addElement(ClassAttribute.read(data, codeEnv));
}
return attribs;
}
/**
* Write the attributes to the output stream
*/
void write(DataOutputStream out) throws IOException {
if (attributes == null) {
out.writeShort(0);
} else {
out.writeShort(attributes.length);
for (int i=0; i