Struts example source code file (SubGraph.java)

This example Struts source code file (SubGraph.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

arraylist, indentwriter, io, ioexception, iterator, iterator, list, render, sitegraphnode, sitegraphnode, string, string, subgraph, subgraph, util

The Struts SubGraph.java source code

/*
 * $Id: SubGraph.java 651946 2008-04-27 13:41:38Z apetrelli $
 *
 * 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.struts2.sitegraph.model;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 */
public class SubGraph implements Render {
    protected String name;
    protected SubGraph parent;
    protected List subGraphs;
    protected List nodes;

    public SubGraph(String name) {
        this.name = name;
        this.subGraphs = new ArrayList();
        this.nodes = new ArrayList();
    }

    public String getName() {
        return name;
    }

    public void addSubGraph(SubGraph subGraph) {
        subGraph.setParent(this);
        subGraphs.add(subGraph);
    }

    public void setParent(SubGraph parent) {
        this.parent = parent;
    }

    public void addNode(SiteGraphNode node) {
        node.setParent(this);
        Graph.nodeMap.put(node.getFullName(), node);
        nodes.add(node);
    }

    public void render(IndentWriter writer) throws IOException {
        // write the header
        writer.write("subgraph cluster_" + getPrefix() + " {", true);
        writer.write("color=grey;");
        writer.write("fontcolor=grey;");
        writer.write("label=\"" + name + "\";");

        // write out the subgraphs
        for (Iterator iterator = subGraphs.iterator(); iterator.hasNext();) {
            SubGraph subGraph = (SubGraph) iterator.next();
            subGraph.render(new IndentWriter(writer));
        }

        // write out the actions
        for (Iterator iterator = nodes.iterator(); iterator.hasNext();) {
            SiteGraphNode siteGraphNode = (SiteGraphNode) iterator.next();
            siteGraphNode.render(writer);
        }

        // .. footer
        writer.write("}", true);
    }

    public String getPrefix() {
        if (parent == null) {
            return name;
        } else {
            String prefix = parent.getPrefix();
            if (prefix.equals("")) {
                return name;
            } else {
                return prefix + "_" + name;
            }
        }
    }

    public SubGraph create(String namespace) {
        if (namespace.equals("")) {
            return this;
        }

        String[] parts = namespace.split("\\/");
        SubGraph last = this;
        for (int i = 0; i < parts.length; i++) {
            String part = parts[i];
            if (part.equals("")) {
                continue;
            }

            SubGraph subGraph = findSubGraph(part);
            if (subGraph == null) {
                subGraph = new SubGraph(part);
                last.addSubGraph(subGraph);
            }

            last = subGraph;
        }

        return last;
    }

    private SubGraph findSubGraph(String name) {
        for (Iterator iterator = subGraphs.iterator(); iterator.hasNext();) {
            SubGraph subGraph = (SubGraph) iterator.next();
            if (subGraph.getName().equals(name)) {
                return subGraph;
            }
        }

        return null;
    }
}