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package com.sun.jdo.api.persistence.enhancer.classfile;
import java.io.*;
import java.util.Vector;
import java.util.Enumeration;
/**
* ExceptionsAttribute represents a method attribute in a class file
* listing the checked exceptions for the method.
*/
public class ExceptionsAttribute extends ClassAttribute {
public final static String expectedAttrName = "Exceptions";//NOI18N
/* The list of checked exceptions */
private Vector exceptionTable;
/* public accessors */
/**
* Return an enumeration of the checked exceptions
*/
public Enumeration exceptions() {
return exceptionTable.elements();
}
/**
* Constructor
*/
public ExceptionsAttribute(ConstUtf8 attrName, Vector excTable) {
super(attrName);
exceptionTable = excTable;
}
/**
* Convenience Constructor - for single exception
*/
public ExceptionsAttribute(ConstUtf8 attrName, ConstClass exc) {
super(attrName);
exceptionTable = new Vector(1);
exceptionTable.addElement(exc);
}
/* package local methods */
static ExceptionsAttribute read(ConstUtf8 attrName,
DataInputStream data, ConstantPool pool)
throws IOException {
int nExcepts = data.readUnsignedShort();
Vector excTable = new Vector();
while (nExcepts-- > 0) {
int excIndex = data.readUnsignedShort();
ConstClass exc_class = null;
if (excIndex != 0)
exc_class = (ConstClass) pool.constantAt(excIndex);
excTable.addElement(exc_class);
}
return new ExceptionsAttribute(attrName, excTable);
}
void write(DataOutputStream out) throws IOException {
out.writeShort(attrName().getIndex());
out.writeInt(2+2*exceptionTable.size());
out.writeShort(exceptionTable.size());
for (int i=0; i<exceptionTable.size(); i++)
out.writeShort(((ConstClass) exceptionTable.elementAt(i)).getIndex());
}
void print(PrintStream out, int indent) {
ClassPrint.spaces(out, indent);
out.print("Exceptions:");//NOI18N
for (int i=0; i<exceptionTable.size(); i++)
out.print(" " + ((ConstClass) exceptionTable.elementAt(i)).asString());//NOI18N
out.println();
}
}
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