- /*
- * 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.
- */
- package org.apache.commons.jxpath;
-
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.List;
-
- /**
- * A simple implementation of NodeSet that behaves as a collection of pointers.
- * @author Dmitri Plotnikov
- * @version $Revision: 1.3 $ $Date: 2004/02/29 14:17:42 $
- */
- public class BasicNodeSet implements NodeSet {
- private List pointers = new ArrayList();
- private List readOnlyPointers;
- private List nodes;
- private List values;
-
- public void add(Pointer pointer) {
- pointers.add(pointer);
- readOnlyPointers = null;
- }
-
- public void remove(Pointer pointer) {
- pointers.remove(pointer);
- readOnlyPointers = null;
- }
-
- public List getPointers() {
- if (readOnlyPointers == null) {
- readOnlyPointers = Collections.unmodifiableList(pointers);
- }
- return readOnlyPointers;
- }
-
- public List getNodes() {
- if (nodes == null) {
- nodes = new ArrayList();
- for (int i = 0; i < pointers.size(); i++) {
- Pointer pointer = (Pointer) pointers.get(i);
- nodes.add(pointer.getValue());
- }
- nodes = Collections.unmodifiableList(nodes);
- }
- return nodes;
- }
-
- public List getValues() {
- if (values == null) {
- values = new ArrayList();
- for (int i = 0; i < pointers.size(); i++) {
- Pointer pointer = (Pointer) pointers.get(i);
- values.add(pointer.getValue());
- }
- values = Collections.unmodifiableList(values);
- }
- return values;
- }
-
- public String toString() {
- return pointers.toString();
- }
- }