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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.
*/
/* $Id$ */
package org.apache.fop.fo;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* Kind of a super-iterator that iterates through child nodes of an FONode,
* in turn managing character iterators for each of them. Caveat: Because this
* class is itself a CharIterator, and manages a collection of CharIterators, it
* is easy to get confused.
*/
public class RecursiveCharIterator extends CharIterator {
/** parent node for whose child nodes this iterator iterates */
private FONode fobj;
/** iterator for the child nodes */
private Iterator childIter = null;
/** current child object that is being managed by childIter*/
private FONode curChild;
/** CharIterator for curChild's characters */
private CharIterator curCharIter = null;
/**
* Constructor which creates an iterator for all child nodes
* @param fobj FONode for which an iterator should be created
*/
public RecursiveCharIterator(FObj fobj) {
// Set up first child iterator
this.fobj = fobj;
this.childIter = fobj.getChildNodes();
getNextCharIter();
}
/**
* Constructor which creates an iterator for only some child nodes
* @param fobj FObj for which an iterator should be created
* @param child FONode of the first child to include in iterator
*/
public RecursiveCharIterator(FObj fobj, FONode child) {
// Set up first child iterator
this.fobj = fobj;
this.childIter = fobj.getChildNodes(child);
getNextCharIter();
}
/**
* @return clone of this, cast as a CharIterator
*/
public CharIterator mark() {
return (CharIterator) this.clone();
}
/**
* @return a clone of this
*/
public Object clone() {
RecursiveCharIterator ci = (RecursiveCharIterator) super.clone();
ci.childIter = fobj.getChildNodes(ci.curChild);
// Need to advance to the next child, else we get the same one!!!
ci.childIter.next();
ci.curCharIter = (CharIterator) curCharIter.clone();
return ci;
}
/**
* Replaces the current character in the CharIterator with a specified
* character
* @param c the character which should be used to replace the current
* character
*/
public void replaceChar(char c) {
if (curCharIter != null) {
curCharIter.replaceChar(c);
}
}
/**
* advances curChild to the next child in the collection, and curCharIter
* to the CharIterator for that item, or sets them to null if the iterator
* has no more items
*/
private void getNextCharIter() {
if (childIter != null && childIter.hasNext()) {
this.curChild = (FONode) childIter.next();
this.curCharIter = curChild.charIterator();
} else {
curChild = null;
curCharIter = null;
}
}
/**
* @return true if there are more items in the CharIterator
*/
public boolean hasNext() {
while (curCharIter != null) {
if (curCharIter.hasNext() == false) {
getNextCharIter();
} else {
return true;
}
}
return false;
}
/**
* @see org.apache.fop.fo.CharIterator#nextChar()
*/
public char nextChar() throws NoSuchElementException {
if (curCharIter != null) {
return curCharIter.nextChar();
} else {
throw new NoSuchElementException();
}
}
/**
* @see java.util.Iterator#remove
*/
public void remove() {
if (curCharIter != null) {
curCharIter.remove();
}
}
}
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