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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.area;
import java.util.List;
/**
* Resolvable Interface. Classes that implement this interface contain
* idrefs (see Section 5.11 of spec for definition of <idref> datatype)
* that are resolved when their target IDs are added to the area tree.
*/
public interface Resolvable {
/**
* Check if this area has been resolved.
*
* @return true once this area is resolved
*/
boolean isResolved();
/**
* Get the array of idrefs of this resolvable object.
* If this object contains child resolvables that are
* resolved through this then it should return the idref's of
* the child also.
*
* @return the id references for resolving this object
*/
String[] getIDs();
/**
* This method allows the Resolvable object to resolve one of
* its unresolved idrefs with the actual set of PageViewports
* containing the target ID. The Resolvable object initially
* identifies to the AreaTreeHandler which idrefs it needs
* resolved. After the idrefs are resolved, the ATH calls this
* method to allow the Resolvable object to update itself with
* the PageViewport information.
*
* @param id an ID matching one of the Resolvable object's
* unresolved idref's.
* @param pages the list of PageViewports with the given ID
*
*/
void resolveIDRef(String id, List pages);
}
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