/*
 * 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 net.jini.core.lookup;

import net.jini.core.entry.Entry;

/**
 * Items in the lookup service are matched using instance of this class.
 * A service item (item) matches a service template (tmpl) if:
 * item.serviceID equals tmpl.serviceID (or if tmpl.serviceID is null);
 * and item.service is an instance of every type in tmpl.serviceTypes; and
 * item.attributeSets contains at least one matching entry for each entry
 * template in tmpl.attributeSetTemplates.
 * <p>
 * An entry matches
 * an entry template if the class of the template is the same as, or a
 * superclass of, the class of the entry, and every non-null field in the
 * template equals the corresponding field of the entry.  Every entry can be
 * used to match more than one template.  Note that in a service template,
 * for serviceTypes and attributeSetTemplates, a null field is equivalent to
 * an empty array; both represent a wildcard.
 *
 * 
 *
 * @since 1.0
 */
public class ServiceTemplate implements java.io.Serializable {

    private static final long serialVersionUID = 7854483807886483216L;

    /**
     * Service ID to match, or <tt>null</tt>.
     *
     * @serial
     */
    public ServiceID serviceID;
    /**
     * Service types to match, or <tt>null</tt>.
     *
     * @serial
     */
    public Class[] serviceTypes;
    /**
     * Attribute set templates to match, or <tt>null</tt>.
     *
     * @serial
     */
    public Entry[] attributeSetTemplates;

    /**
     * Simple constructor.
     *
     * @param serviceID service ID to match, or null
     * @param serviceTypes service types to match, or null
     * @param attrSetTemplates attribute set templates to match, or null
     */
    public ServiceTemplate(ServiceID serviceID,
			   Class[] serviceTypes,
			   Entry[] attrSetTemplates) {
	this.serviceID = serviceID;
	this.serviceTypes = serviceTypes;
	this.attributeSetTemplates = attrSetTemplates;
    }
    
    /**
     * Returns a <code>String</code> representation of this 
     * <code>ServiceTemplate</code>.
     * @return <code>String</code> representation of this 
     * <code>ServiceTemplate</code>
     */
    public String toString() {
	StringBuffer sBuffer = new StringBuffer();
	sBuffer.append(
	       getClass().getName()).append(
	       "[serviceID=").append(
	       serviceID).append(
	       ", serviceTypes=");
	if (serviceTypes != null) {
            sBuffer.append("[");
            if (serviceTypes.length > 0) {
                for (int i = 0; i < serviceTypes.length - 1; i++)
                    sBuffer.append(serviceTypes[i]).append(" ");
                sBuffer.append(serviceTypes[serviceTypes.length - 1]);
            }
            sBuffer.append("]");
	} else {
	    sBuffer.append((Object)null);
	}
	sBuffer.append(", attributeSetTemplates=");
	if (attributeSetTemplates != null) {
            sBuffer.append("[");
            if (attributeSetTemplates.length > 0) {
                for (int i = 0; i < attributeSetTemplates.length - 1; i++)
                    sBuffer.append(attributeSetTemplates[i]).append(" ");
                sBuffer.append(
                    attributeSetTemplates[attributeSetTemplates.length - 1]);
            }
            sBuffer.append("]");
	} else {
	    sBuffer.append((Object)null);
	}
	return sBuffer.append("]").toString();
    }
}