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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.flow.table;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.apache.fop.fo.ValidationException;
/**
* A row group builder accommodating a variable number of columns. More flexible, but less
* efficient.
*/
class VariableColRowGroupBuilder extends RowGroupBuilder {
VariableColRowGroupBuilder(Table t) {
super(t);
}
/**
* Each event is recorded and will be played once the table is finished, and the final
* number of columns known.
*/
private static interface Event {
/**
* Plays this event
*
* @param rowGroupBuilder the delegate builder which will actually create the row
* groups
* @throws ValidationException if a row-spanning cell overflows its parent body
*/
void play(RowGroupBuilder rowGroupBuilder) throws ValidationException;
}
/** The queue of events sent to this builder. */
private List events = new LinkedList();
/** {@inheritDoc} */
void addTableCell(final TableCell cell) {
events.add(new Event() {
public void play(RowGroupBuilder rowGroupBuilder) {
rowGroupBuilder.addTableCell(cell);
}
});
}
/** {@inheritDoc} */
void startTableRow(final TableRow tableRow) {
events.add(new Event() {
public void play(RowGroupBuilder rowGroupBuilder) {
rowGroupBuilder.startTableRow(tableRow);
}
});
}
/** {@inheritDoc} */
void endTableRow() {
events.add(new Event() {
public void play(RowGroupBuilder rowGroupBuilder) {
rowGroupBuilder.endTableRow();
}
});
}
/** {@inheritDoc} */
void endRow(final TableBody part) {
events.add(new Event() {
public void play(RowGroupBuilder rowGroupBuilder) {
rowGroupBuilder.endRow(part);
}
});
}
/** {@inheritDoc} */
void startTablePart(final TableBody part) {
events.add(new Event() {
public void play(RowGroupBuilder rowGroupBuilder) {
rowGroupBuilder.startTablePart(part);
}
});
}
/** {@inheritDoc} */
void endTablePart() throws ValidationException {
// TODO catch the ValidationException sooner?
events.add(new Event() {
public void play(RowGroupBuilder rowGroupBuilder) throws ValidationException {
rowGroupBuilder.endTablePart();
}
});
}
/** {@inheritDoc} */
void endTable() throws ValidationException {
RowGroupBuilder delegate = new FixedColRowGroupBuilder(table);
for (Iterator eventIter = events.iterator(); eventIter.hasNext();) {
((Event) eventIter.next()).play(delegate);
}
delegate.endTable();
}
}
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