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;
023import java.util.stream.Collectors;
024
025import com.google.common.collect.Iterables;
026
027/**
028 * Here, key is holding the alias and value the operand.
029 *
030 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
031 */
032public class SelectList extends LinkedHashMap<String, Operand> implements Serializable {
033
034    private static final long serialVersionUID = 548479243558815176L;
035
036    /**
037     * Don't use this method anymore. Now we can easily iterate over {@link SelectList} with {@link #keySet()},
038     * {@link #values()} or {@link #entrySet()}.
039     * <p>
040     * We kept this method because removing it could lead to regressions as ({@link #get(Object)} is a candidate.
041     *
042     * @deprecated since 9.1
043     */
044    @Deprecated
045    public Operand get(int i) {
046        return Iterables.get(values(), i);
047    }
048
049    @Override
050    public String toString() {
051        if (isEmpty()) {
052            return "*";
053        }
054        return values().stream().map(Operand::toString).collect(Collectors.joining(", "));
055    }
056
057}