001: /*
002: * Licensed to the Apache Software Foundation (ASF) under one or more
003: * contributor license agreements. See the NOTICE file distributed with
004: * this work for additional information regarding copyright ownership.
005: * The ASF licenses this file to You under the Apache License, Version 2.0
006: * (the "License"); you may not use this file except in compliance with
007: * the License. You may obtain a copy of the License at
008: *
009: * http://www.apache.org/licenses/LICENSE-2.0
010: *
011: * Unless required by applicable law or agreed to in writing, software
012: * distributed under the License is distributed on an "AS IS" BASIS,
013: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014: * See the License for the specific language governing permissions and
015: * limitations under the License.
016: */
017: package org.apache.wicket.markup.repeater;
018:
019: import java.util.Comparator;
020:
021: import org.apache.wicket.markup.html.WebMarkupContainer;
022: import org.apache.wicket.model.IModel;
023: import org.apache.wicket.version.undo.Change;
024:
025: /**
026: * Container that holds components in a RefreshingView. One Item represents one
027: * entire row of the view. Users should add all containing components to the
028: * Item instead of the view, this is accomplished by implementing
029: * refreshingView.populateItem(Item item).
030: *
031: * @see RefreshingView
032: *
033: * @author Igor Vaynberg (ivaynberg)
034: */
035: public class Item extends WebMarkupContainer {
036: private static final long serialVersionUID = 1L;
037:
038: /** relative index of this item */
039: private int index;
040:
041: /**
042: * @param id
043: * component id
044: * @param index
045: * relative index of this item in the pageable view
046: * @param model
047: * model for this item
048: */
049: public Item(final String id, int index, final IModel model) {
050: super (id.intern(), model);
051: this .index = index;
052: }
053:
054: /**
055: * Sets the index of this item
056: *
057: * @param index
058: * new index
059: */
060: public void setIndex(int index) {
061: if (this .index != index) {
062: if (isVersioned()) {
063: addStateChange(new Change() {
064: final int oldIndex = Item.this .index;
065: private static final long serialVersionUID = 1L;
066:
067: public void undo() {
068: Item.this .index = oldIndex;
069: }
070:
071: public String toString() {
072: return "IndexChange[component: " + getPath()
073: + ", index: " + oldIndex + "]";
074: }
075: });
076: }
077: this .index = index;
078: }
079: }
080:
081: /**
082: * @return the index assigned to this item
083: */
084: public int getIndex() {
085: return index;
086: }
087:
088: /**
089: * @return the primary key assigned to this item
090: */
091: public String getPrimaryKey() {
092: return getId();
093: }
094:
095: /**
096: * Comparator that compares Items by their index property
097: *
098: * @author Igor Vaynberg (ivaynberg)
099: *
100: */
101: public static class IndexComparator implements Comparator {
102: private static final Comparator instance = new IndexComparator();
103:
104: /**
105: * @return static instance of the comparator
106: */
107: public static final Comparator getInstance() {
108: return instance;
109: }
110:
111: /**
112: * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
113: */
114: public int compare(Object o1, Object o2) {
115: Item lhs = (Item) o1;
116: Item rhs = (Item) o2;
117: return lhs.getIndex() - rhs.getIndex();
118: }
119:
120: };
121:
122: }
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