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/*
* Copyright 2004-2005 The Apache Software Foundation.
*
* Licensed 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.ArrayList;
import java.util.List;
import java.util.ListIterator;
/**
* Represents a list of Knuth elements.
*/
/**
*
*/
public abstract class KnuthSequence extends ArrayList {
/**
* Creates a new and empty list.
*/
public KnuthSequence() {
super();
}
/**
* Creates a new list from an existing list.
* @param list The list from which to create the new list.
*/
public KnuthSequence(List list) {
super(list);
}
/**
* Marks the start of the sequence.
*/
public void startSequence() {
}
/**
* Finalizes a Knuth sequence.
* @return a finalized sequence.
*/
public abstract KnuthSequence endSequence();
/**
* Can sequence be appended to this sequence?
* @param sequence The sequence that may be appended.
* @return whether the sequence can be appended to this sequence.
*/
public abstract boolean canAppendSequence(KnuthSequence sequence);
/**
* Append sequence to this sequence if it can be appended.
* TODO In principle the LayoutManager can also be retrieved from the elements in the sequence.
* @param sequence The sequence that is to be appended.
* @param lm The LayoutManager for the Position that may have to be created.
* @return whether the sequence was succesfully appended to this sequence.
*/
public abstract boolean appendSequence(KnuthSequence sequence, LayoutManager lm);
/**
* Append sequence to this sequence if it can be appended.
* If that is not possible, close this sequence.
* TODO In principle the LayoutManager can also be retrieved from the elements in the sequence.
* @param sequence The sequence that is to be appended.
* @param lm The LayoutManager for the Position that may have to be created.
* @return whether the sequence was succesfully appended to this sequence.
*/
public abstract boolean appendSequenceOrClose(KnuthSequence sequence, LayoutManager lm);
/**
* Wrap the Positions of the elements of this sequence in a Position for LayoutManager lm.
* @param lm The LayoutManager for the Positions that will be created.
*/
public void wrapPositions(LayoutManager lm) {
ListIterator listIter = listIterator();
KnuthElement element;
while (listIter.hasNext()) {
element = (KnuthElement) listIter.next();
element.setPosition
(lm.notifyPos(new NonLeafPosition(lm, element.getPosition())));
}
}
/**
* @return the last element of this sequence.
*/
public KnuthElement getLast() {
int idx = size();
if (idx == 0) {
return null;
}
return (KnuthElement) get(idx - 1);
}
/**
* Remove the last element of this sequence.
* @return the removed element.
*/
public KnuthElement removeLast() {
int idx = size();
if (idx == 0) {
return null;
}
return (KnuthElement) remove(idx - 1);
}
/**
* @param index The index of the element to be returned
* @return the element at index index.
*/
public KnuthElement getElement(int index) {
return (KnuthElement) get(index);
}
/**
* Is this an inline or a block sequence?
* @return true if this is an inline sequence
*/
public abstract boolean isInlineSequence();
}
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