org.apache.abdera2.model.selector.LinkRelSelector.java Source code

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Here is the source code for org.apache.abdera2.model.selector.LinkRelSelector.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  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.  For additional information regarding
 * copyright in this work, please see the NOTICE file in the top level
 * directory of this distribution.
 */
package org.apache.abdera2.model.selector;

import java.util.Set;

import org.apache.abdera2.common.selector.AbstractSelector;
import org.apache.abdera2.common.selector.Selector;
import org.apache.abdera2.model.Link;

import com.google.common.collect.ImmutableSet;

/**
 * Selector implementation that selects Link elements 
 * that match a given set of rel attribute values
 * @see org.apache.abdera2.common.selector.Selector
 */
public class LinkRelSelector extends AbstractSelector<Link> implements Selector<Link> {

    public static Selector<Link> of(String... rels) {
        return new LinkRelSelector(rels);
    }

    private static final long serialVersionUID = 7008363856043465676L;
    private final Set<String> rels;

    LinkRelSelector(String... rels) {
        this.rels = ImmutableSet.copyOf(rels);
    }

    public boolean select(Object item) {
        if (!(item instanceof Link))
            return false;
        Link link = (Link) item;
        String rel = link.getRel();
        rel = rel == null || rel.length() == 0 ? Link.REL_ALTERNATE : rel;
        rel = rel.toLowerCase();
        return rels.isEmpty() || rels.contains(rel) || rels.contains(Link.Helper.getRelEquiv(rel));
    }

}