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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.layoutmgr;
import java.util.List;
/**
* Represents a list of block level Knuth elements.
*/
public class BlockKnuthSequence extends KnuthSequence {
private boolean isClosed = false;
/**
* Creates a new and empty list.
*/
public BlockKnuthSequence() {
super();
}
/**
* Creates a new list from an existing list.
* @param list The list from which to create the new list.
*/
public BlockKnuthSequence(List list) {
super(list);
}
/** {@inheritDoc} */
public boolean isInlineSequence() {
return false;
}
/** {@inheritDoc} */
public boolean canAppendSequence(KnuthSequence sequence) {
return !sequence.isInlineSequence() && !isClosed;
}
/** {@inheritDoc} */
public boolean appendSequence(KnuthSequence sequence) {
// log.debug("Cannot append a sequence without a BreakElement");
return false;
}
/** {@inheritDoc} */
public boolean appendSequence(KnuthSequence sequence, boolean keepTogether,
BreakElement breakElement) {
if (!canAppendSequence(sequence)) {
return false;
}
if (keepTogether) {
breakElement.setPenaltyValue(KnuthElement.INFINITE);
add(breakElement);
} else if (!((ListElement) getLast()).isGlue()) {
breakElement.setPenaltyValue(0);
add(breakElement);
}
addAll(sequence);
return true;
}
/** {@inheritDoc} */
public KnuthSequence endSequence() {
isClosed = true;
return this;
}
}
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