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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 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;
- }
-
- }
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