Tomcat example source code file (ValidatorTask.java)

This example Tomcat source code file (ValidatorTask.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 - Tomcat tags/keywords

baseredirectorhelpertask, bufferedinputstream, buildexception, buildexception, cannot, classloader, file, file, fileinputstream, io, sax, string, string, validation, validation, validatortask

The Tomcat ValidatorTask.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.catalina.ant;


import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import org.apache.catalina.startup.Constants;
import org.apache.catalina.startup.DigesterFactory;
import org.apache.tomcat.util.digester.Digester;
import org.apache.tools.ant.BuildException;
import org.xml.sax.InputSource;


/**
 * Task for validating a web application deployment descriptor, using XML 
 * schema validation.
 *
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 * @since 5.0
 */

public class ValidatorTask extends BaseRedirectorHelperTask {


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


    // ------------------------------------------------------------- Properties


    /**
     * The path to the webapp directory.
     */
    protected String path = null;

    public String getPath() {
        return (this.path);
    }

    public void setPath(String path) {
        this.path = path;
    }


    // --------------------------------------------------------- Public Methods


    /**
     * Execute the specified command.  This logic only performs the common
     * attribute validation required by all subclasses; it does not perform
     * any functional logic directly.
     *
     * @exception BuildException if a validation error occurs
     */
    public void execute() throws BuildException {

        if (path == null) {
            throw new BuildException("Must specify 'path'");
        }

        File file = new File(path, Constants.ApplicationWebXml);
        if ((!file.exists()) || (!file.canRead())) {
            throw new BuildException("Cannot find web.xml");
        }

        // Commons-logging likes having the context classloader set
        ClassLoader oldCL = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader
            (ValidatorTask.class.getClassLoader());

        Digester digester = DigesterFactory.newDigester(true, true, null);
        try {
            file = file.getCanonicalFile();
            InputStream stream = 
                new BufferedInputStream(new FileInputStream(file));
            InputSource is = new InputSource(file.toURL().toExternalForm());
            is.setByteStream(stream);
            digester.parse(is);
            handleOutput("web.xml validated");
        } catch (Throwable t) {
            if (isFailOnError()) {
                throw new BuildException("Validation failure", t);
            } else {
                handleErrorOutput("Validation failure: " + t);
            }
        } finally {
            Thread.currentThread().setContextClassLoader(oldCL);
            closeRedirector();
        }

    }


}