ObjectDataCompiler.java

package org.drools.template;

import java.io.InputStream;
import java.util.Collection;

import org.drools.template.parser.DefaultTemplateContainer;
import org.drools.template.parser.TemplateContainer;
import org.drools.template.parser.TemplateDataListener;

import org.drools.template.objects.ObjectDataProvider;

/**
 * This class provides additional methods for invoking the template
 * compiler, taking the actual parameters from maps or objects.
 * 
 * @author Wolfgang Laun
 *
 */
public class ObjectDataCompiler extends DataProviderCompiler {

	/**
	 * Compile templates, substituting from a collection of maps or objects
	 * into the given template.
	 * @param objs the collection of maps or objects
	 * @param template the template resource pathname
	 * @return the expanded rules as a string
	 */
	public String compile(final Collection<?> objs, final String template) {
		final InputStream templateStream = this.getClass().getResourceAsStream( template );
		return compile( objs, templateStream );
	}

	/**
	 * Compile templates, substituting from a collection of maps or objects
	 * into the given template.
	 * @param objs objs the collection of maps or objects
	 * @param templateStream the template as a stream
	 * @return the expanded rules as a string
	 */
	public String compile(final Collection<?> objs,
			final InputStream templateStream) {
		TemplateContainer tc = new DefaultTemplateContainer( templateStream );
		closeStream( templateStream );
		return compile( new ObjectDataProvider( tc, objs ),
				        new TemplateDataListener( tc ) );
	}
}