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Ant example source code file (ApacheCatalogResolver.java)

This example Ant source code file (ApacheCatalogResolver.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 - Ant tags/keywords

apachecatalog, apachecatalog, apachecatalogresolver, apachecatalogresolver, buildexception, buildexception, catalogresolver, io, ioexception, malformedurlexception, net, network, resourcelocation, resourcelocation, string, url, wrong

The ApacheCatalogResolver.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.tools.ant.types.resolver;

import java.io.IOException;

import java.net.MalformedURLException;
import java.net.URL;

import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.types.XMLCatalog;
import org.apache.tools.ant.types.ResourceLocation;

import org.apache.xml.resolver.Catalog;
import org.apache.xml.resolver.CatalogManager;

import org.apache.xml.resolver.tools.CatalogResolver;

/**
 * <p>This class extends the CatalogResolver class provided by Norman
 * Walsh's resolver library in xml-commons.  It provides the bridge
 * between the Ant XMLCatalog datatype and the xml-commons Catalog
 * class.  XMLCatalog calls methods in this class using Reflection in
 * order to avoid requiring the xml-commons resolver library in the
 * path.</p>
 *
 * <p>The {@link org.apache.tools.ant.types.resolver.ApacheCatalog
 * ApacheCatalog} class is used to parse external catalog files, which
 * can be in either <a
 * href="http://oasis-open.org/committees/entity/background/9401.html">
 * plain text format</a> or 
 *
 * <p>For each entry found in an external catalog file, if any, an
 * instance of {@link org.apache.tools.ant.types.ResourceLocation
 * ResourceLocation} is created and added to the controlling
 * XMLCatalog datatype.  In this way, these entries will be included
 * in XMLCatalog's lookup algorithm.  See XMLCatalog.java for more
 * details.</p>
 *
 * @see org.apache.tools.ant.types.XMLCatalog.CatalogResolver
 * @see org.apache.xml.resolver.CatalogManager
 * @since Ant 1.6
 */

public class ApacheCatalogResolver extends CatalogResolver {

    /** The XMLCatalog object to callback. */
    private XMLCatalog xmlCatalog = null;

    static {
        //
        // If you don't do this, you get all sorts of annoying
        // warnings about a missing properties file.  However, it
        // seems to work just fine with default values.  Ultimately,
        // we should probably include a "CatalogManager.properties"
        // file in the ant jarfile with some default property
        // settings.  See CatalogManager.java for more details.
        //
        CatalogManager.getStaticManager().setIgnoreMissingProperties(true);

        //
        // Make sure CatalogResolver instantiates ApacheCatalog,
        // rather than a plain Catalog
        //
        System.getProperties().put("xml.catalog.className",
                                   ApacheCatalog.class.getName());

        CatalogManager.getStaticManager().setUseStaticCatalog(false);

        // debug
        // CatalogManager.getStaticManager().setVerbosity(4);
    }

    /**
     * Set the XMLCatalog object to callback.
     * @param xmlCatalog the XMLCatalog to use.
     */
    public void setXMLCatalog(XMLCatalog xmlCatalog) {
        this.xmlCatalog = xmlCatalog;
    }

    /**
     * XMLCatalog calls this to add an external catalog file for each
     * file within a <code><catalogfiles> fileset.
     * @param file the external catalog file.
     */
    public void parseCatalog(String file) {

        Catalog catalog = getCatalog();
        if (!(catalog instanceof ApacheCatalog)) {
            throw new BuildException("Wrong catalog type found: " + catalog.getClass().getName());
        }
        ApacheCatalog apacheCatalog = (ApacheCatalog) catalog;

        // Pass in reference to ourselves so we can be called back.
        apacheCatalog.setResolver(this);

        try {
            apacheCatalog.parseCatalog(file);
        } catch (MalformedURLException ex) {
            throw new BuildException(ex);
        } catch (IOException ex) {
            throw new BuildException(ex);
        }
    }

    /**
     * <p>Add a PUBLIC catalog entry to the controlling XMLCatalog instance.
     * ApacheCatalog calls this for each PUBLIC entry found in an external
     * catalog file.</p>
     *
     * @param publicid The public ID of the resource
     * @param systemid The system ID (aka location) of the resource
     * @param base The base URL of the resource.  If the systemid
     * specifies a relative URL/pathname, it is resolved using the
     * base.  The default base for an external catalog file is the
     * directory in which the catalog is located.
     *
     */
    public void addPublicEntry(String publicid,
                               String systemid,
                               URL base) {

        ResourceLocation dtd = new ResourceLocation();
        dtd.setBase(base);
        dtd.setPublicId(publicid);
        dtd.setLocation(systemid);

        xmlCatalog.addDTD(dtd);
    }

    /**
     * <p>Add a URI catalog entry to the controlling XMLCatalog instance.
     * ApacheCatalog calls this for each URI entry found in an external
     * catalog file.</p>
     *
     * @param uri The URI of the resource
     * @param altURI The URI to which the resource should be mapped
     * (aka the location)
     * @param base The base URL of the resource.  If the altURI
     * specifies a relative URL/pathname, it is resolved using the
     * base.  The default base for an external catalog file is the
     * directory in which the catalog is located.
     *
     */
    public void addURIEntry(String uri,
                            String altURI,
                            URL base) {

        ResourceLocation entity = new ResourceLocation();
        entity.setBase(base);
        entity.setPublicId(uri);
        entity.setLocation(altURI);

        xmlCatalog.addEntity(entity);
    }

} //-- ApacheCatalogResolver
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