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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 org.apache.fop.fo.properties.CommonBorderPaddingBackground;
import org.apache.fop.util.CharUtilities;
import java.util.NoSuchElementException;
/**
* A recursive char iterator that indicates boundaries by returning
* an EOT char.
*/
public class InlineCharIterator extends RecursiveCharIterator {
private boolean startBoundary = false;
private boolean endBoundary = false;
/**
* @param fobj the object for whose character contents and for whose
* descendant's character contents should be iterated
* @param bpb the CommonBorderPaddingBackground properties to be applied
*/
public InlineCharIterator(FObj fobj, CommonBorderPaddingBackground bpb) {
super(fobj);
checkBoundaries(bpb);
}
private void checkBoundaries(CommonBorderPaddingBackground bpb) {
/* Current understanding is that an <fo:inline> is always a boundary for
* whitespace collapse if it has a border or not
startBoundary = (bpb.getBorderStartWidth(false) > 0
|| bpb.getPaddingStart(false, null) > 0); // TODO do we need context here?
endBoundary = (bpb.getBorderEndWidth(false) > 0
|| bpb.getPaddingEnd(false, null) > 0); // TODO do we need context here?
*/
startBoundary = true;
endBoundary = true;
}
/**
* @return true if there are more characters
*/
public boolean hasNext() {
if (startBoundary) {
return true;
}
return (super.hasNext() || endBoundary);
/* If super.hasNext() returns false,
* we return true if we are going to return a "boundary" signal
* else false.
*/
}
/**
* @return the next character
* @throws NoSuchElementException if there are no more characters
*/
public char nextChar() throws NoSuchElementException {
if (startBoundary) {
startBoundary = false;
return CharUtilities.CODE_EOT;
}
try {
return super.nextChar();
} catch (NoSuchElementException e) {
// Underlying has nothing more to return
// Check end boundary char
if (endBoundary) {
endBoundary = false;
return CharUtilities.CODE_EOT;
} else {
throw e;
}
}
}
}
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