org.obiba.onyx.engine.ActionDefinitionReader.java Source code

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Here is the source code for org.obiba.onyx.engine.ActionDefinitionReader.java

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/*******************************************************************************
 * Copyright 2008(c) The OBiBa Consortium. All rights reserved.
 * 
 * This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package org.obiba.onyx.engine;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.springframework.core.io.Resource;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider;

/**
 * Deserialises {@code ActionDefinition} instances from XML files using XStream.
 */
public class ActionDefinitionReader {

    private XStream xstream;

    private Resource[] resources;

    public ActionDefinitionReader() {
        // Use a PureJavaReflectionProvider so that XStream instantiates objects using standard Java reflection.
        xstream = new XStream(new PureJavaReflectionProvider());
        // Create an alias for the root node
        xstream.alias("actionDefinitions", ArrayList.class);
        // Create an alias for ActionDefinition nodes
        xstream.alias("actionDefinition", ActionDefinition.class);
    }

    public void setResources(Resource[] resources) {
        this.resources = resources;
    }

    @SuppressWarnings("unchecked")
    public List<ActionDefinition> read() throws IOException {
        List<ActionDefinition> definitions = new ArrayList<ActionDefinition>();
        for (int i = 0; i < this.resources.length; i++) {
            Resource resource = this.resources[i];
            if (resource.exists()) {
                definitions.addAll((List<ActionDefinition>) xstream.fromXML(resource.getInputStream()));
            }
        }
        return definitions;
    }
}