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package org.eclipse.jdt.core;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import java.util.EventObject;
/**
* A buffer changed event describes how a buffer has changed. These events are
* used in <code>IBufferChangedListener</code> notifications.
* <p>
* For text insertions, <code>getOffset</code> is the offset
* of the first inserted character, <code>getText</code> is the
* inserted text, and <code>getLength</code> is 0.
* </p>
* <p>
* For text removals, <code>getOffset</code> is the offset
* of the first removed character, <code>getText</code> is <code>null</code>,
* and <code>getLength</code> is the length of the text that was removed.
* </p>
* <p>
* For replacements (including <code>IBuffer.setContents</code>),
* <code>getOffset</code> is the offset
* of the first replaced character, <code>getText</code> is the replacement
* text, and <code>getLength</code> is the length of the original text
* that was replaced.
* </p>
* <p>
* When a buffer is closed, <code>getOffset</code> is 0, <code>getLength</code>
* is 0, and <code>getText</code> is <code>null</code>.
* </p>
* <p>
* This class is not intended to be instantiated or subclassed by clients.
* Instances of this class are automatically created by the Java model.
* </p>
*
* @see IBuffer
*/
public class BufferChangedEvent extends EventObject {
/**
* The length of text that has been modified in the buffer.
*/
private int length;
/**
* The offset into the buffer where the modification took place.
*/
private int offset;
/**
* The text that was modified.
*/
private String text;
/**
* Creates a new buffer changed event indicating that the given buffer has changed.
*/
public BufferChangedEvent(IBuffer buffer, int offset, int length, String text) {
super(buffer);
this.offset = offset;
this.length = length;
this.text = text;
}
/**
* Returns the buffer which has changed.
*
* @return the buffer affected by the change
*/
public IBuffer getBuffer() {
return (IBuffer) source;
}
/**
* Returns the length of text removed or replaced in the buffer, or
* 0 if text has been inserted into the buffer.
*
* @return the length of the original text fragment modified by the
* buffer change (<code> 0 </code> in case of insertion).
*/
public int getLength() {
return this.length;
}
/**
* Returns the index of the first character inserted, removed, or replaced
* in the buffer.
*
* @return the source offset of the textual manipulation in the buffer
*/
public int getOffset() {
return this.offset;
}
/**
* Returns the text that was inserted, the replacement text,
* or <code>null</code> if text has been removed.
*
* @return the text corresponding to the buffer change (<code> null </code>
* in case of deletion).
*/
public String getText() {
return this.text;
}
}
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