org.xchain.namespaces.sax.UrlSourceCommand.java Source code

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Here is the source code for org.xchain.namespaces.sax.UrlSourceCommand.java

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/**
 *    Copyright 2011 meltmedia
 *
 *    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.xchain.namespaces.sax;

import java.net.URL;

import org.apache.commons.jxpath.JXPathContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xchain.Command;
import org.xchain.Locatable;
import org.xchain.annotations.Element;
import org.xchain.annotations.Attribute;
import org.xchain.annotations.AttributeType;
import org.xchain.framework.net.DependencyTracker;
import org.xchain.framework.net.UrlFactory;
import org.xchain.framework.sax.CommandXmlReader;
import org.xchain.framework.sax.ContextInputSource;
import org.xchain.impl.ChainImpl;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.Locator;

/**
 * @author Christian Trimble
 * @author Josh Kennedy
 */
@Element(localName = "url-source")
public abstract class UrlSourceCommand extends ChainImpl implements Locatable {
    public static Logger log = LoggerFactory.getLogger(UrlSourceCommand.class);

    @Attribute(localName = "system-id", type = AttributeType.JXPATH_VALUE)
    public abstract String getSystemId(JXPathContext context);

    /**
     * The name of the parameter.
     */
    public boolean execute(JXPathContext context) throws Exception {
        InputSource inputSource = null;
        XMLReader xmlReader = null;
        DependencyTracker dependencyTracker = DependencyTracker.getInstance();
        String systemId = getSystemId(context);
        URL url = UrlFactory.getInstance().newUrl(getLocator().getSystemId(), systemId);
        inputSource = new InputSource();
        inputSource.setSystemId(systemId);
        inputSource.setByteStream(url.openStream());

        // set the source in the pipeline config.
        PipelineCommand.getPipelineConfig().setSource(inputSource);
        if (xmlReader != null) {
            PipelineCommand.getPipelineConfig().setXmlReader(xmlReader);
        }

        return false;
    }
}