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 com.google.common.collect.Iterables; 022 023/** 024 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a> 025 */ 026public class FromClause extends Clause { 027 028 private static final long serialVersionUID = 3563271484181691679L; 029 030 public static final int DOCTYPE = 0; 031 032 public static final int LOCATION = 1; 033 034 public final FromList elements; 035 036 public final int type; 037 038 public FromClause() { 039 this(new FromList()); 040 } 041 042 public FromClause(FromList elements) { 043 this(DOCTYPE, elements); 044 } 045 046 public FromClause(int type, FromList elements) { 047 super("FROM"); 048 this.elements = elements; 049 this.type = type; 050 } 051 052 public void add(String alias, String element) { 053 elements.put(alias, element); 054 } 055 056 public void add(String element) { 057 elements.put(element, element); 058 } 059 060 public String get(int i) { 061 return Iterables.get(elements.values(), i); 062 } 063 064 public String get(String alias) { 065 return elements.get(alias); 066 } 067 068 public String getAlias(int i) { 069 return Iterables.get(elements.keySet(), i); 070 } 071 072 public int count() { 073 return elements.size(); 074 } 075 076 public int getType() { 077 return type; 078 } 079 080 @Override 081 public void accept(IVisitor visitor) { 082 visitor.visitFromClause(this); 083 } 084 085 @Override 086 public boolean equals(Object obj) { 087 if (this == obj) { 088 return true; 089 } 090 if (obj instanceof FromClause) { 091 FromClause sc = (FromClause) obj; 092 return elements.equals(sc.elements); 093 } 094 return false; 095 } 096 097 @Override 098 public int hashCode() { 099 return elements.hashCode(); 100 } 101 102 @Override 103 public String toString() { 104 return elements.toString(); 105 } 106 107}