001/*
002 * (C) Copyright 2006-2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 */
019package org.nuxeo.ecm.core.query.sql.model;
020
021import java.io.Serializable;
022import java.util.LinkedHashMap;
023
024import com.google.common.collect.Iterables;
025
026/**
027 * Here, key is holding the alias and value the document type.
028 *
029 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
030 */
031public class FromList extends LinkedHashMap<String, String> implements Serializable {
032
033    private static final long serialVersionUID = -1931385427413643944L;
034
035    /**
036     * Don't use this method anymore. Now we can easily iterate over {@link FromList} with {@link #keySet()},
037     * {@link #values()} or {@link #entrySet()}.
038     * <p />
039     * We kept this method because removing it could lead to regressions as ({@link #get(Object)} is a candidate.
040     *
041     * @deprecated since 9.1
042     */
043    @Deprecated
044    public String get(int i) {
045        return Iterables.get(values(), i);
046    }
047
048    @Override
049    public String toString() {
050        if (isEmpty()) {
051            return "";
052        }
053        return String.join(", ", values());
054    }
055
056}