| /* |
| * 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 static final long serialVersionUID = 1648962416582509095L; |
| |
| private boolean isClosed; |
| |
| /** |
| * 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 (!getLast().isGlue()) { |
| breakElement.setPenaltyValue(0); |
| add(breakElement); |
| } |
| addAll(sequence); |
| return true; |
| } |
| |
| /** {@inheritDoc} */ |
| public KnuthSequence endSequence() { |
| isClosed = true; |
| return this; |
| } |
| |
| } |