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Commons JXPath example source code file (NullPointer.java)

This example Commons JXPath source code file (NullPointer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons JXPath tags/keywords

cannot, jxpathcontext, locale, nodepointer, nodepointer, nullpointer, nullpointer, object, object, propertyownerpointer, qname, qname, string, unsupportedoperationexception, util

The Commons JXPath NullPointer.java source code

/*
 * 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.
 */
package org.apache.commons.jxpath.ri.model.beans;

import java.util.Locale;

import org.apache.commons.jxpath.JXPathContext;
import org.apache.commons.jxpath.ri.QName;
import org.apache.commons.jxpath.ri.model.NodePointer;

/**
 * Pointer whose value is <code>null.
 * @author Dmitri Plotnikov
 * @version $Revision: 652915 $ $Date: 2008-05-02 16:12:57 -0500 (Fri, 02 May 2008) $
 */
public class NullPointer extends PropertyOwnerPointer {
    private QName name;
    private String id;

    private static final long serialVersionUID = 2193425983220679887L;

    /**
     * Create a new NullPointer.
     * @param name node name
     * @param locale Locale
     */
    public NullPointer(QName name, Locale locale) {
        super(null, locale);
        this.name = name;
    }

    /**
     * Used for the root node.
     * @param parent parent pointer
     * @param name node name
     */
    public NullPointer(NodePointer parent, QName name) {
        super(parent);
        this.name = name;
    }

    /**
     * Create a new NullPointer.
     * @param locale Locale
     * @param id String
     */
    public NullPointer(Locale locale, String id) {
        super(null, locale);
        this.id = id;
    }

    public QName getName() {
        return name;
    }

    public Object getBaseValue() {
        return null;
    }

    public boolean isCollection() {
        return false;
    }

    public boolean isLeaf() {
        return true;
    }

    public boolean isActual() {
        return false;
    }

    public PropertyPointer getPropertyPointer() {
        return new NullPropertyPointer(this);
    }

    public NodePointer createPath(JXPathContext context, Object value) {
        if (parent != null) {
            return parent.createPath(context, value).getValuePointer();
        }
        throw new UnsupportedOperationException(
            "Cannot create the root object: " + asPath());
    }

    public NodePointer createPath(JXPathContext context) {
        if (parent != null) {
            return parent.createPath(context).getValuePointer();
        }
        throw new UnsupportedOperationException(
            "Cannot create the root object: " + asPath());
    }

    public NodePointer createChild(
        JXPathContext context,
        QName name,
        int index) {
        return createPath(context).createChild(context, name, index);
    }

    public NodePointer createChild(
        JXPathContext context,
        QName name,
        int index,
        Object value) {
        return createPath(context).createChild(context, name, index, value);
    }

    public int hashCode() {
        return name == null ? 0 : name.hashCode();
    }

    public boolean equals(Object object) {
        if (object == this) {
            return true;
        }

        if (!(object instanceof NullPointer)) {
            return false;
        }

        NullPointer other = (NullPointer) object;
        return name == other.name || name != null && name.equals(other.name);
    }

    public String asPath() {
        if (id != null) {
            return "id(" + id + ")";
        }
        return parent == null ? "null()" : super.asPath();
    }

    public int getLength() {
        return 0;
    }
}

Other Commons JXPath examples (source code examples)

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