ResourcePredicate.java

/*-
 * 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.sling.query.resource;

import java.util.ArrayList;
import java.util.List;

import javax.jcr.Node;
import javax.jcr.RepositoryException;

import org.apache.commons.lang.StringUtils;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.query.api.Predicate;
import org.apache.sling.query.resource.jcr.JcrTypeResolver;
import org.apache.sling.query.selector.parser.Attribute;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ResourcePredicate implements Predicate<Resource> {

	private static final Logger LOG = LoggerFactory.getLogger(ResourcePredicate.class);

	private final String resourceType;

	private final String resourceName;

	private final List<Predicate<Resource>> subPredicates;

	private JcrTypeResolver typeResolver;

	public ResourcePredicate(String resourceType, String resourceName, List<Attribute> attributes,
			JcrTypeResolver typeResolver) {
		this.resourceType = resourceType;
		this.resourceName = resourceName;
		this.subPredicates = new ArrayList<Predicate<Resource>>();
		for (Attribute a : attributes) {
			subPredicates.add(new ResourcePropertyPredicate(a));
		}
		this.typeResolver = typeResolver;
	}

	@Override
	public boolean accepts(Resource resource) {
		if (StringUtils.isNotBlank(resourceName) && !resource.getName().equals(resourceName)) {
			return false;
		}
		if (!isResourceType(resource, resourceType)) {
			return false;
		}
		for (Predicate<Resource> predicate : subPredicates) {
			if (!predicate.accepts(resource)) {
				return false;
			}
		}
		return true;
	}

	private boolean isResourceType(Resource resource, String resourceType) {
		if (StringUtils.isBlank(resourceType)) {
			return true;
		}
		if (resource.isResourceType(resourceType)) {
			return true;
		}
		if (!isValidType(resourceType)) {
			return false;
		}
		Node node = resource.adaptTo(Node.class);
		try {
			if (node != null) {
				return node.isNodeType(resourceType);
			}
		} catch (RepositoryException e) {
			LOG.error("Can't check node type", e);
		}
		return false;
	}

	private boolean isValidType(String type) {
		return typeResolver.isJcrType(type);
	}
}