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/*
* Copyright 1999-2004 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 org.apache.fop.traits.SpaceVal;
import java.util.ArrayList;
import java.util.List;
import org.apache.fop.traits.MinOptMax;
/**
* Accumulate a sequence of space-specifiers (XSL space type) on
* areas with a stacking constraint. Provide a way to resolve these into
* a single MinOptMax value.
*/
public class SpaceSpecifier implements Cloneable {
private boolean startsReferenceArea;
private boolean hasForcing = false;
private List spaceVals = new ArrayList();
/**
* Creates a new SpaceSpecifier.
* @param startsReferenceArea true if it starts a new reference area
*/
public SpaceSpecifier(boolean startsReferenceArea) {
this.startsReferenceArea = startsReferenceArea;
}
/**
* @see java.lang.Object#clone()
*/
public Object clone() {
try {
SpaceSpecifier ss = (SpaceSpecifier) super.clone();
ss.startsReferenceArea = startsReferenceArea;
ss.hasForcing = hasForcing;
// Clone the vector, but share the objects in it!
ss.spaceVals = new ArrayList();
ss.spaceVals.addAll(spaceVals);
return ss;
} catch (CloneNotSupportedException cnse) {
return null;
}
}
/**
* Clear all space specifiers
*/
public void clear() {
hasForcing = false;
spaceVals.clear();
}
/**
* Indicates whether any space-specifiers have been added.
* @return true if any space-specifiers have been added.
*/
public boolean hasSpaces() {
return (spaceVals.size() > 0);
}
/**
* Add a new space to the sequence. If this sequence starts a reference
* area, and the added space is conditional, and there are no
* non-conditional values in the sequence yet, then ignore it. Otherwise
* add it to the sequence.
*/
public void addSpace(SpaceVal moreSpace) {
if (!startsReferenceArea
|| !moreSpace.isConditional()
|| !spaceVals.isEmpty()) {
if (moreSpace.isForcing()) {
if (!hasForcing) {
// Remove all other values (must all be non-forcing)
spaceVals.clear();
hasForcing = true;
}
spaceVals.add(moreSpace);
} else if (!hasForcing) {
// Don't bother adding all 0 space-specifier if not forcing
if (moreSpace.getSpace().min != 0
|| moreSpace.getSpace().opt != 0
|| moreSpace.getSpace().max != 0) {
spaceVals.add(moreSpace);
}
}
}
}
/**
* Resolve the current sequence of space-specifiers, accounting for
* forcing values.
* @param endsReferenceArea True if the sequence should be resolved
* at the trailing edge of reference area.
* @return The resolved value as a min/opt/max triple.
*/
public MinOptMax resolve(boolean endsReferenceArea) {
int lastIndex = spaceVals.size();
if (endsReferenceArea) {
// Start from the end and count conditional specifiers
// Stop at first non-conditional
for (; lastIndex > 0; --lastIndex) {
SpaceVal spaceVal = (SpaceVal) spaceVals.get(lastIndex - 1);
if (!spaceVal.isConditional()) {
break;
}
}
}
MinOptMax resolvedSpace = new MinOptMax(0);
int maxPrecedence = -1;
for (int index = 0; index < lastIndex; index++) {
SpaceVal spaceVal = (SpaceVal) spaceVals.get(index);
if (hasForcing) {
resolvedSpace.add(spaceVal.getSpace());
} else if (spaceVal.getPrecedence() > maxPrecedence) {
maxPrecedence = spaceVal.getPrecedence();
resolvedSpace = spaceVal.getSpace();
} else if (spaceVal.getPrecedence() == maxPrecedence) {
if (spaceVal.getSpace().opt > resolvedSpace.opt) {
resolvedSpace = spaceVal.getSpace();
} else if (spaceVal.getSpace().opt == resolvedSpace.opt) {
if (resolvedSpace.min < spaceVal.getSpace().min) {
resolvedSpace.min = spaceVal.getSpace().min;
}
if (resolvedSpace.max > spaceVal.getSpace().max) {
resolvedSpace.max = spaceVal.getSpace().max;
}
}
}
}
return resolvedSpace;
}
public String toString() {
return "Space Specifier (resolved at begin/end of ref. area:):\n" +
resolve(false).toString() + "\n" +
resolve(true).toString();
}
}
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