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/*
* 06/30/2012
*
* RDocumentCharSequence.java - Iterator over a portion of an RTextArea's
* document.
*
* This library is distributed under a modified BSD license. See the included
* RSyntaxTextArea.License.txt file for details.
*/
package org.fife.ui.rtextarea;
import javax.swing.text.BadLocationException;
/**
* Allows iterating over a portion of an RDocument. This is of
* course not thread-safe, so should only be used on the EDT or with external
* synchronization.
*
* @author Robert Futrell
* @version 1.0
*/
class RDocumentCharSequence implements CharSequence {
private RDocument doc;
private int start;
private int end;
/**
* Creates a CharSequence representing the text in a document
* from the specified offset to the end of that document.
*
* @param doc The document.
* @param start The starting offset in the document, inclusive.
*/
public RDocumentCharSequence(RDocument doc, int start) {
this(doc, start, doc.getLength());
}
/**
* Constructor.
*
* @param doc The document.
* @param start The starting offset in the document, inclusive.
* @param end the ending offset in the document, exclusive.
*/
public RDocumentCharSequence(RDocument doc, int start, int end) {
this.doc = doc;
this.start = start;
this.end = end;
}
/**
* {@inheritDoc}
*/
public char charAt(int index) {
if (index<0 || index>=length()) {
throw new IndexOutOfBoundsException("Index " + index +
" is not in range [0-" + length() + ")");
}
try {
return doc.charAt(start+index);
} catch (BadLocationException ble) {
throw new IndexOutOfBoundsException(ble.toString());
}
}
/**
* {@inheritDoc}
*/
public int length() {
return end - start;
}
/**
* {@inheritDoc}
*/
public CharSequence subSequence(int start, int end) {
if (start<0) {
throw new IndexOutOfBoundsException("start must be >= 0 (" +
start + ")");
}
else if (end<0) {
throw new IndexOutOfBoundsException("end must be >= 0 (" +
end + ")");
}
else if (end>length()) {
throw new IndexOutOfBoundsException("end must be <= " +
length() + " (" + end + ")");
}
else if (start>end) {
throw new IndexOutOfBoundsException("start (" + start +
") cannot be > end (" + end + ")");
}
int newStart = this.start + start;
int newEnd = this.start + end;
return new RDocumentCharSequence(doc, newStart, newEnd);
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
try {
return doc.getText(start, length());
} catch (BadLocationException ble) { // Never happens
ble.printStackTrace();
return "";
}
}
}