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/*
* 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 org.apache.bcel.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import org.apache.bcel.Const;
import org.apache.bcel.Constants;
/**
* This class represents an entry in the exception table of the <em>Code</em>
* attribute and is used only there. It contains a range in which a
* particular exception handler is active.
*
* @version $Id$
* @see Code
*/
public final class CodeException implements Cloneable, Node, Constants {
private int start_pc; // Range in the code the exception handler is
private int end_pc; // active. start_pc is inclusive, end_pc exclusive
private int handler_pc; /* Starting address of exception handler, i.e.,
* an offset from start of code.
*/
private int catch_type; /* If this is zero the handler catches any
* exception, otherwise it points to the
* exception class which is to be caught.
*/
/**
* Initialize from another object.
*/
public CodeException(final CodeException c) {
this(c.getStartPC(), c.getEndPC(), c.getHandlerPC(), c.getCatchType());
}
/**
* Construct object from file stream.
* @param file Input stream
* @throws IOException
*/
CodeException(final DataInput file) throws IOException {
this(file.readUnsignedShort(), file.readUnsignedShort(), file.readUnsignedShort(), file
.readUnsignedShort());
}
/**
* @param start_pc Range in the code the exception handler is active,
* start_pc is inclusive while
* @param end_pc is exclusive
* @param handler_pc Starting address of exception handler, i.e.,
* an offset from start of code.
* @param catch_type If zero the handler catches any
* exception, otherwise it points to the exception class which is
* to be caught.
*/
public CodeException(final int start_pc, final int end_pc, final int handler_pc, final int catch_type) {
this.start_pc = start_pc;
this.end_pc = end_pc;
this.handler_pc = handler_pc;
this.catch_type = catch_type;
}
/**
* 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.visitCodeException(this);
}
/**
* Dump code exception to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
public final void dump( final DataOutputStream file ) throws IOException {
file.writeShort(start_pc);
file.writeShort(end_pc);
file.writeShort(handler_pc);
file.writeShort(catch_type);
}
/**
* @return 0, if the handler catches any exception, otherwise it points to
* the exception class which is to be caught.
*/
public final int getCatchType() {
return catch_type;
}
/**
* @return Exclusive end index of the region where the handler is active.
*/
public final int getEndPC() {
return end_pc;
}
/**
* @return Starting address of exception handler, relative to the code.
*/
public final int getHandlerPC() {
return handler_pc;
}
/**
* @return Inclusive start index of the region where the handler is active.
*/
public final int getStartPC() {
return start_pc;
}
/**
* @param catch_type the type of exception that is caught
*/
public final void setCatchType( final int catch_type ) {
this.catch_type = catch_type;
}
/**
* @param end_pc end of handled block
*/
public final void setEndPC( final int end_pc ) {
this.end_pc = end_pc;
}
/**
* @param handler_pc where the actual code is
*/
public final void setHandlerPC( final int handler_pc ) { // TODO unused
this.handler_pc = handler_pc;
}
/**
* @param start_pc start of handled block
*/
public final void setStartPC( final int start_pc ) { // TODO unused
this.start_pc = start_pc;
}
/**
* @return String representation.
*/
@Override
public final String toString() {
return "CodeException(start_pc = " + start_pc + ", end_pc = " + end_pc + ", handler_pc = "
+ handler_pc + ", catch_type = " + catch_type + ")";
}
/**
* @return String representation.
*/
public final String toString( final ConstantPool cp, final boolean verbose ) {
String str;
if (catch_type == 0) {
str = "<Any exception>(0)";
} else {
str = Utility.compactClassName(cp.getConstantString(catch_type, Const.CONSTANT_Class), false)
+ (verbose ? "(" + catch_type + ")" : "");
}
return start_pc + "\t" + end_pc + "\t" + handler_pc + "\t" + str;
}
public final String toString( final ConstantPool cp ) {
return toString(cp, true);
}
/**
* @return deep copy of this object
*/
public CodeException copy() {
try {
return (CodeException) clone();
} catch (final CloneNotSupportedException e) {
// TODO should this throw?
}
return null;
}
}
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