org.jdbcluster.clustertype.ClusterTypeConfigImpl.java Source code

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Here is the source code for org.jdbcluster.clustertype.ClusterTypeConfigImpl.java

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/*
 * Copyright 2002-2005 the original author or authors.
 * 
 * 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.jdbcluster.clustertype;

import java.util.ArrayList;
import java.util.List;

import org.dom4j.DocumentException;
import org.dom4j.Node;
import org.jdbcluster.JDBClusterConfigurationBase;

/**
 * class ClusterTypeConfig is an implementation of ClusterTypeConfig.
 * It saves the location of the configuration file and
 * exexutes some queries on that XML file.
 * @author Philipp Noggler
 * @author Tobi
 */

public class ClusterTypeConfigImpl extends JDBClusterConfigurationBase implements ClusterTypeConfig {

    /**
     * Default constructor
     *
     */
    public ClusterTypeConfigImpl() {
    }

    /**
     * Constructor which sets the config path
     * @param config the configuration to be set
     */
    public ClusterTypeConfigImpl(String config) {
        this.setConfiguration(config);
    }

    /**
     * returns the config path
     * @return String
     */
    public String getConfiguration() {
        return configuration;
    }

    /**
     * sets the path, reads out the document and saves it
     * @param configuration the config path
     */
    public void setConfiguration(String configuration) {
        this.configuration = configuration;
        try {
            document = read(configuration);
        } catch (DocumentException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * returns the name of the specified clustertype 
     * or null if there is none (via xPath)
     * @param CTName ClusterType name
     * @return String
     */
    public String getClusterType(String CTName) {

        String xPath = "//jdbcluster/clustertype/cluster[@id='" + CTName + "']";
        Node node = document.selectSingleNode(xPath);

        if (node == null) {
            return null;
        } else {
            return node.valueOf("@id");
        }
    }

    /**
     * returns the classname of the given ClusterType
     * @deprecated use {@link ClusterType.getClusterClass()} instead
     * @param ct ClusterType
     * @return String
     */
    @Deprecated
    public String getClusterClassName(String clusterTypeName) {
        //xPath expression to get the classname
        String xPath = "//jdbcluster/clustertype/cluster[@id='" + clusterTypeName + "']";

        Node node = document.selectSingleNode(xPath);

        if (node == null) {
            return null;
        } else {
            //returns the classname as a String
            return node.valueOf("@class");
        }
    }

    /**
     * returns the classname of the given ClusterType
     * @param CTName the ClusterType's name as a String
     * @return String
     */
    public String getClassName(String CTName) {

        //xPath expression to get the classname
        String xPath = "//jdbcluster/clustertype/cluster[@id='" + CTName + "']";

        Node node = document.selectSingleNode(xPath);

        if (node == null) {
            return null;
        } else {
            //returns the classname as a String
            return node.valueOf("@class");
        }
    }

    /**
     * returns a list of all cluster ids
     * @return List<String>
     */
    @SuppressWarnings("unchecked")
    public List<String> getClusterIDs() {
        ArrayList<String> clusterIDs = new ArrayList<String>();
        //xPath expression to get the classname
        String xPath = "//jdbcluster/clustertype/cluster";

        List<Node> nodes = document.selectNodes(xPath);
        if (nodes != null) {
            for (Node n : nodes) {
                clusterIDs.add(n.valueOf("@id"));
            }
        }
        return clusterIDs;
    }

    /**
     * class name of cluster interceptor
     * @return String
     */
    public String getClusterInterceptorClassName() {
        String xPath = "//jdbcluster/clustertype";

        Node node = document.selectSingleNode(xPath);

        if (node == null) {
            return null;
        } else {
            //returns the classname as a String
            return node.valueOf("@clusterInterceptor");
        }
    }

    /**
     * returns the name of the specified clustertype
     * from a given class name
     * @param className given cluster class name
     * @return cluster type name
     */
    public String getClusterTypeFromClass(String className) {
        String xPath = "//jdbcluster/clustertype/cluster[@class='" + className + "']";
        Node node = document.selectSingleNode(xPath);

        if (node == null) {
            return null;
        } else {
            return node.valueOf("@id");
        }
    }
}