145 lines
3.4 KiB
Java
145 lines
3.4 KiB
Java
/*
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* Copyright 2000-2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package org.apache.bcel.classfile;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.io.Serializable;
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/**
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* This class represents a (PC offset, line number) pair, i.e., a line number in
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* the source that corresponds to a relative address in the byte code. This is
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* used for debugging purposes.
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*
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* @version $Id: LineNumber.java 386056 2006-03-15 11:31:56Z tcurdt $
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* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
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* @see LineNumberTable
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*/
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public final class LineNumber implements Cloneable, Node, Serializable {
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/**
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*
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*/
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private static final long serialVersionUID = 1L;
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private int start_pc; // Program Counter (PC) corresponds to line
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private int line_number; // number in source file
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/**
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* Initialize from another object.
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*/
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public LineNumber(LineNumber c) {
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this(c.getStartPC(), c.getLineNumber());
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}
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/**
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* Construct object from file stream.
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*
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* @param file
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* Input stream
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* @throws IOException
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*/
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LineNumber(DataInputStream file) throws IOException {
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this(file.readUnsignedShort(), file.readUnsignedShort());
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}
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/**
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* @param start_pc
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* Program Counter (PC) corresponds to
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* @param line_number
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* line number in source file
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*/
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public LineNumber(int start_pc, int line_number) {
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this.start_pc = start_pc;
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this.line_number = line_number;
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}
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/**
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* Called by objects that are traversing the nodes of the tree implicitely
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* defined by the contents of a Java class. I.e., the hierarchy of methods,
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* fields, attributes, etc. spawns a tree of objects.
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*
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* @param v
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* Visitor object
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*/
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@Override
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public void accept(Visitor v) {
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v.visitLineNumber(this);
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}
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/**
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* Dump line number/pc pair to file stream in binary format.
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*
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* @param file
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* Output file stream
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* @throws IOException
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*/
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public final void dump(DataOutputStream file) throws IOException {
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file.writeShort(start_pc);
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file.writeShort(line_number);
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}
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/**
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* @return Corresponding source line
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*/
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public final int getLineNumber() {
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return line_number;
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}
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/**
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* @return PC in code
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*/
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public final int getStartPC() {
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return start_pc;
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}
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/**
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* @param line_number
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* the source line number
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*/
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public final void setLineNumber(int line_number) {
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this.line_number = line_number;
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}
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/**
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* @param start_pc
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* the pc for this line number
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*/
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public final void setStartPC(int start_pc) {
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this.start_pc = start_pc;
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}
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/**
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* @return String representation
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*/
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@Override
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public final String toString() {
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return "LineNumber(" + start_pc + ", " + line_number + ")";
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}
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/**
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* @return deep copy of this object
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*/
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public LineNumber copy() {
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try {
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return (LineNumber) clone();
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} catch (CloneNotSupportedException e) {
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}
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return null;
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}
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}
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