org.apache.tomcat.util.bcel.classfile.CodeException Maven / Gradle / Ivy
/*
* 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.tomcat.util.bcel.classfile;
import java.io.DataInput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.Serializable;
import org.apache.tomcat.util.bcel.Constants;
/**
* This class represents an entry in the exception table of the Code
* attribute and is used only there. It contains a range in which a
* particular exception handler is active.
*
* @version $Id: CodeException.java 992409 2010-09-03 18:35:59Z markt $
* @author M. Dahm
* @see Code
*/
public final class CodeException implements Cloneable, Constants, Serializable {
private static final long serialVersionUID = -6351674720658890686L;
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.
*/
/**
* Construct object from file stream.
* @param file Input stream
* @throws IOException
*/
CodeException(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(int start_pc, int end_pc, int handler_pc, int catch_type) {
this.start_pc = start_pc;
this.end_pc = end_pc;
this.handler_pc = handler_pc;
this.catch_type = catch_type;
}
/**
* Dump code exception to file stream in binary format.
*
* @param file Output file stream
* @throws IOException
*/
public final void dump( DataOutputStream file ) throws IOException {
file.writeShort(start_pc);
file.writeShort(end_pc);
file.writeShort(handler_pc);
file.writeShort(catch_type);
}
/**
* @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( ConstantPool cp, boolean verbose ) {
String str;
if (catch_type == 0) {
str = "(0)";
} else {
str = Utility.compactClassName(cp.getConstantString(catch_type, CONSTANT_Class), false)
+ (verbose ? "(" + catch_type + ")" : "");
}
return start_pc + "\t" + end_pc + "\t" + handler_pc + "\t" + str;
}
/**
* @return deep copy of this object
*/
public CodeException copy() {
try {
return (CodeException) clone();
} catch (CloneNotSupportedException e) {
}
return null;
}
}