/*
 * Copyright 2002,2004-2005 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.catalina.ant.jmx;

import java.io.IOException;
import java.net.MalformedURLException;

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.taskdefs.condition.Condition;

/**
 *
 * Definition
 * <pre> 
 *   &lt;path id="catalina_ant">
 *       &lt;fileset dir="${catalina.home}/server/lib">
 *           &lt;include name="catalina-ant.jar"/>
 *           &lt;include name="catalina-ant-jmx.jar"/>
 *       &lt;/fileset>
 *   &lt;/path>
 *
 *   &lt;typedef
 *       name="jmxEquals"
 *       classname="org.apache.catalina.ant.jmx.JMXAccessorEqualsCondition"
 *       classpathref="catalina_ant"/>
 * </pre>
 * 
 * usage: Wait for start backup node
 * <pre>
 *     &lt;target name="wait"&gt;
 *        &lt;waitfor maxwait="${maxwait}" maxwaitunit="second" timeoutproperty="server.timeout" &gt;
 *           &lt;and&gt;
 *               &lt;socket server="${server.name}" port="${server.port}"/&gt;
 *               &lt;http url="${url}"/&gt;
 *               &lt;jmxEquals 
 *                   host="localhost" port="9014" username="controlRole" password="tomcat"
 *                   name="Catalina:type=IDataSender,host=localhost,senderAddress=192.168.111.1,senderPort=9025"
 *                   attribute="connected" value="true"
 *               /&gt;
 *           &lt;/and&gt;
 *       &lt;/waitfor&gt;
 *       &lt;fail if="server.timeout" message="Server ${url} don't answer inside ${maxwait} sec" /&gt;
 *       &lt;echo message="Server ${url} alive" /&gt;
 *   &lt;/target&gt;
 *
 * </pre>
 * 
 * @author Peter Rossbach
 * @version $Revision$ $Date$
 * @since 5.5.10
 *
 */
public class JMXAccessorEqualsCondition  extends ProjectComponent  implements Condition {

    // ----------------------------------------------------- Instance Variables

    private String url = null;
    private String host = "localhost";
    private String port = "8050";
    private String password = null;
    private String username = null;
    private String name = null;
    private String attribute;
    private String value;
    private String ref = "jmx.server" ;
    // ----------------------------------------------------- Instance Info

    /**
     * Descriptive information describing this implementation.
     */
    private static final String info = "org.apache.catalina.ant.JMXAccessorEqualsCondition/1.1";

    /**
     * Return descriptive information about this implementation and the
     * corresponding version number, in the format
     * <code>&lt;description&gt;/&lt;version&gt;</code>.
     */
    public String getInfo() {

        return (info);

    }
    // ----------------------------------------------------- Properties

    /**
     * @return Returns the attribute.
     */
    public String getAttribute() {
        return attribute;
    }
    /**
     * @param attribute The attribute to set.
     */
    public void setAttribute(String attribute) {
        this.attribute = attribute;
    }
    /**
     * @return Returns the host.
     */
    public String getHost() {
        return host;
    }
    /**
     * @param host The host to set.
     */
    public void setHost(String host) {
        this.host = host;
    }
    /**
     * @return Returns the name.
     */
    public String getName() {
        return name;
    }
    /**
     * @param objectName The name to set.
     */
    public void setName(String objectName) {
        this.name = objectName;
    }
    /**
     * @return Returns the password.
     */
    public String getPassword() {
        return password;
    }
    /**
     * @param password The password to set.
     */
    public void setPassword(String password) {
        this.password = password;
    }
    /**
     * @return Returns the port.
     */
    public String getPort() {
        return port;
    }
    /**
     * @param port The port to set.
     */
    public void setPort(String port) {
        this.port = port;
    }
    /**
     * @return Returns the url.
     */
    public String getUrl() {
        return url;
    }
    /**
     * @param url The url to set.
     */
    public void setUrl(String url) {
        this.url = url;
    }
    /**
     * @return Returns the username.
     */
    public String getUsername() {
        return username;
    }
    /**
     * @param username The username to set.
     */
    public void setUsername(String username) {
        this.username = username;
    }
    /**
     * @return Returns the value.
     */
    public String getValue() {
        return value;
    }
    // The setter for the "value" attribute
    public void setValue(String value) {
        this.value = value;
    }

    /**
     * @return Returns the ref.
     */
    public String getRef() {
        return ref;
    }
    /**
     * @param refId The ref to set.
     */
    public void setRef(String refId) {
        this.ref = refId;
    }
    
    protected MBeanServerConnection getJMXConnection()
            throws MalformedURLException, IOException {
        return JMXAccessorTask.accessJMXConnection(
                getProject(),
                getUrl(), getHost(),
                getPort(), getUsername(), getPassword(), ref);
    }

    /**
     * @return The value
     */
    protected String accessJMXValue() {
        try {
            Object result = getJMXConnection().getAttribute(
                    new ObjectName(name), attribute);
            if(result != null)
                return result.toString();
        } catch (Exception e) {
            // ignore access or connection open errors
        }
        return null;
    }

    // This method evaluates the condition
    public boolean eval() {
        if (value == null) {
            throw new BuildException("value attribute is not set");
        }
        if ((name == null || attribute == null)) {
            throw new BuildException(
                    "Must specify a 'attribute', name for equals condition");
        }
        //FIXME check url or host/parameter
        String jmxValue = accessJMXValue();
        if(jmxValue != null)
            return jmxValue.equals(value);
        return false;
    }
}