Struts example source code file (SimpleNode.java)

This example Struts source code file (SimpleNode.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 - Struts tags/keywords

class, elexception, elexception, elsupport, exception, methodinfo, node, node, object, object, simplenode, string, string, unsupportedoperationexception

The Struts SimpleNode.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.
 */
/* Generated By:JJTree: Do not edit this line. SimpleNode.java */

package org.apache.struts2.el.parser;

import javax.el.ELException;
import javax.el.MethodInfo;
import javax.el.PropertyNotWritableException;

import org.apache.struts2.el.lang.ELSupport;
import org.apache.struts2.el.lang.EvaluationContext;
import org.apache.struts2.el.util.MessageFactory;


/**
 * @author Jacob Hookom [jacob@hookom.net]
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: markt $
 */
public abstract class SimpleNode extends ELSupport implements Node {
    protected Node parent;

    protected Node[] children;

    protected int id;

    protected String image;

    public SimpleNode(int i) {
        id = i;
    }

    public void jjtOpen() {
    }

    public void jjtClose() {
    }

    public void jjtSetParent(Node n) {
        parent = n;
    }

    public Node jjtGetParent() {
        return parent;
    }

    public void jjtAddChild(Node n, int i) {
        if (children == null) {
            children = new Node[i + 1];
        } else if (i >= children.length) {
            Node c[] = new Node[i + 1];
            System.arraycopy(children, 0, c, 0, children.length);
            children = c;
        }
        children[i] = n;
    }

    public Node jjtGetChild(int i) {
        return children[i];
    }

    public int jjtGetNumChildren() {
        return (children == null) ? 0 : children.length;
    }

    /*
     * You can override these two methods in subclasses of SimpleNode to
     * customize the way the node appears when the tree is dumped. If your
     * output uses more than one line you should override toString(String),
     * otherwise overriding toString() is probably all you need to do.
     */

    public String toString() {
        if (this.image != null) {
            return ELParserTreeConstants.jjtNodeName[id] + "[" + this.image
                    + "]";
        }
        return ELParserTreeConstants.jjtNodeName[id];
    }

    public String toString(String prefix) {
        return prefix + toString();
    }

    /*
     * Override this method if you want to customize how the node dumps out its
     * children.
     */

    public void dump(String prefix) {
        System.out.println(toString(prefix));
        if (children != null) {
            for (int i = 0; i < children.length; ++i) {
                SimpleNode n = (SimpleNode) children[i];
                if (n != null) {
                    n.dump(prefix + " ");
                }
            }
        }
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public Class getType(EvaluationContext ctx)
            throws ELException {
        throw new UnsupportedOperationException();
    }

    public Object getValue(EvaluationContext ctx)
            throws ELException {
        throw new UnsupportedOperationException();
    }

    public boolean isReadOnly(EvaluationContext ctx)
            throws ELException {
        return true;
    }

    public void setValue(EvaluationContext ctx, Object value)
            throws ELException {
        throw new PropertyNotWritableException(MessageFactory.get("error.syntax.set"));
    }

    public void accept(NodeVisitor visitor) throws Exception {
        visitor.visit(this);
        if (this.children != null && this.children.length > 0) {
            for (int i = 0; i < this.children.length; i++) {
                this.children[i].accept(visitor);
            }
        }
    }

    public Object invoke(EvaluationContext ctx, Class[] paramTypes, Object[] paramValues) throws ELException {
        throw new UnsupportedOperationException();
    }

    public MethodInfo getMethodInfo(EvaluationContext ctx, Class[] paramTypes) throws ELException {
        throw new UnsupportedOperationException();
    }
}