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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.area;
-
- import java.io.IOException;
- import java.io.ObjectInputStream;
- import java.io.Serializable;
- import java.util.ArrayList;
- import java.util.List;
-
- /**
- * Link resolving for resolving internal links.
- */
- public class LinkResolver implements Resolvable, Serializable {
-
- private static final long serialVersionUID = -7102134165192960718L;
-
- private boolean resolved;
- private String idRef;
- private Area area;
- private transient List<Resolvable> dependents;
-
- public LinkResolver() {
- this(null, null);
- }
-
- /**
- * Create a new link resolver.
- *
- * @param id the id to resolve
- * @param a the area that will have the link attribute
- */
- public LinkResolver(String id, Area a) {
- idRef = id;
- area = a;
- }
-
- private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException {
- ois.defaultReadObject();
- }
-
- /**
- * @return true if this link is resolved
- */
- public boolean isResolved() {
- return resolved;
- }
-
- /**
- * Get the references for this link.
- *
- * @return the String array of references.
- */
- public String[] getIDRefs() {
- return new String[] {idRef};
- }
-
- /**
- * Resolve by adding an internal link to the first PageViewport in the list.
- *
- * {@inheritDoc}
- */
- public void resolveIDRef(String id, List<PageViewport> pages) {
- resolveIDRef(id, pages.get(0));
- }
-
- /**
- * Resolve by adding an InternalLink trait to the area
- *
- * @param id the target id (should be equal to the object's idRef)
- * @param pv the PageViewport containing the first area with the given id
- */
- public void resolveIDRef(String id, PageViewport pv) {
- if (idRef.equals(id) && pv != null) {
- resolved = true;
- if (area != null) {
- Trait.InternalLink iLink = new Trait.InternalLink(pv.getKey(), idRef);
- area.addTrait(Trait.INTERNAL_LINK, iLink);
- area = null; // break circular reference from basic link area to this resolver
- }
- resolveDependents(id, pv);
- }
- }
-
- /**
- * Add dependent resolvable. Used to resolve second-order resolvables that
- * depend on resolution of this resolver.
- * @param dependent resolvable
- */
- public void addDependent(Resolvable dependent) {
- if (dependents == null) {
- dependents = new ArrayList<Resolvable>();
- }
- dependents.add(dependent);
- }
-
- private void resolveDependents(String id, PageViewport pv) {
- if (dependents != null) {
- List<PageViewport> pages = new ArrayList<PageViewport>();
- pages.add(pv);
- for (Resolvable r : dependents) {
- r.resolveIDRef(id, pages);
- }
- }
- }
-
- }
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