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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.properties;
import org.apache.fop.datatypes.CompoundDatatype;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.expr.PropertyException;
/**
* Class for properties that wrap Keep values
*/
public final class KeepProperty extends Property implements CompoundDatatype {
/** class holding all canonical KeepProperty instances*/
private static final PropertyCache cache = new PropertyCache(KeepProperty.class);
private boolean isCachedValue = false;
private Property withinLine;
private Property withinColumn;
private Property withinPage;
/**
* Inner class for creating instances of KeepProperty
*/
public static class Maker extends CompoundPropertyMaker {
/**
* @param propId the id of the property for which a Maker should be created
*/
public Maker(int propId) {
super(propId);
}
/**
* Create a new empty instance of KeepProperty.
* @return the new instance.
*/
public Property makeNewProperty() {
return new KeepProperty();
}
/**
* {@inheritDoc}
*/
public Property convertProperty(Property p, PropertyList propertyList, FObj fo)
throws PropertyException
{
if (p instanceof KeepProperty) {
return p;
}
return super.convertProperty(p, propertyList, fo);
}
}
/**
* {@inheritDoc}
*/
public void setComponent(int cmpId, Property cmpnValue,
boolean bIsDefault) {
if (isCachedValue) {
log.warn("KeepProperty.setComponent() called on cached value. Ignoring...");
return;
}
if (cmpId == CP_WITHIN_LINE) {
setWithinLine(cmpnValue, bIsDefault);
} else if (cmpId == CP_WITHIN_COLUMN) {
setWithinColumn(cmpnValue, bIsDefault);
} else if (cmpId == CP_WITHIN_PAGE) {
setWithinPage(cmpnValue, bIsDefault);
}
}
/**
* {@inheritDoc}
*/
public Property getComponent(int cmpId) {
if (cmpId == CP_WITHIN_LINE) {
return getWithinLine();
} else if (cmpId == CP_WITHIN_COLUMN) {
return getWithinColumn();
} else if (cmpId == CP_WITHIN_PAGE) {
return getWithinPage();
} else {
return null;
}
}
/**
* @param withinLine withinLine property to set
* @param bIsDefault not used (??)
*/
public void setWithinLine(Property withinLine, boolean bIsDefault) {
this.withinLine = withinLine;
}
/**
* @param withinColumn withinColumn property to set
* @param bIsDefault not used (??)
*/
protected void setWithinColumn(Property withinColumn,
boolean bIsDefault) {
this.withinColumn = withinColumn;
}
/**
* @param withinPage withinPage property to set
* @param bIsDefault not used (??)
*/
public void setWithinPage(Property withinPage, boolean bIsDefault) {
this.withinPage = withinPage;
}
/**
* @return the withinLine property
*/
public Property getWithinLine() {
return this.withinLine;
}
/**
* @return the withinColumn property
*/
public Property getWithinColumn() {
return this.withinColumn;
}
/**
* @return the withinPage property
*/
public Property getWithinPage() {
return this.withinPage;
}
/**
* Not sure what to do here. There isn't really a meaningful single value.
* @return String representation
*/
public String toString() {
return "Keep[" +
"withinLine:" + getWithinLine().getObject() +
", withinColumn:" + getWithinColumn().getObject() +
", withinPage:" + getWithinPage().getObject() + "]";
}
/**
* @return the canonical KeepProperty instance corresponding to
* this property
*/
public KeepProperty getKeep() {
KeepProperty keep = (KeepProperty) cache.fetch(this);
/* make sure setComponent() can never alter cached values */
keep.isCachedValue = true;
return keep;
}
/**
* @return this.keep cast as Object
*/
public Object getObject() {
return this;
}
/** {@inheritDoc} */
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o instanceof KeepProperty) {
KeepProperty keep = (KeepProperty) o;
return (keep.withinColumn == this.withinColumn)
&& (keep.withinLine == this.withinLine)
&& (keep.withinPage == this.withinPage);
}
return false;
}
/** {@inheritDoc} */
public int hashCode() {
int hash = 17;
hash = 37 * hash + (withinColumn == null ? 0 : withinColumn.hashCode());
hash = 37 * hash + (withinLine == null ? 0 : withinLine.hashCode());
hash = 37 * hash + (withinPage == null ? 0 : withinPage.hashCode());
return hash;
}
}
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