001/*
002 *  Copyright 2010 Anyware Services
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 */
016package org.ametys.plugins.repository.query.expression;
017
018/**
019 * Constructs an {@link Expression} corresponding to the boolean comparison with a metadata.
020 */
021public class BooleanExpression implements Expression
022{
023    private boolean _value;
024    private MetadataExpression _metadata;
025    private Operator _operator;
026
027    /**
028     * Creates the comparison Expression.
029     * @param metadata the metadata name
030     * @param value the boolean value
031     */
032    public BooleanExpression(String metadata, boolean value)
033    {
034        this(metadata, Operator.EQ, value);
035    }
036    
037    /**
038     * Creates the comparison Expression.
039     * @param metadata the metadata name
040     * @param operator the operator to make the comparison
041     * @param value the boolean value
042     */
043    public BooleanExpression(String metadata, Operator operator, boolean value)
044    {
045        _value = value;
046        _operator = operator;
047        _metadata = new MetadataExpression(metadata);
048    }
049    
050    /**
051     * Creates the comparison Expression.
052     * @param metadata the metadata name
053     * @param value the boolean value
054     * @param unversioned true if the metadata is unversioned, false otherwise.
055     */
056    public BooleanExpression(String metadata, boolean value, boolean unversioned)
057    {
058        this(metadata, Operator.EQ, value, unversioned);
059    }
060    
061    /**
062     * Creates the comparison Expression.
063     * @param metadata the metadata name
064     * @param operator the operator to make the comparison
065     * @param value the boolean value
066     * @param unversioned true if the metadata is unversioned, false otherwise.
067     */
068    public BooleanExpression(String metadata, Operator operator, boolean value, boolean unversioned)
069    {
070        _value = value;
071        _operator = operator;
072        _metadata = new MetadataExpression(metadata, unversioned);
073    }
074
075
076    public String build()
077    {
078        return _metadata.build() + " " + _operator + " " + Boolean.toString(_value) + "()";
079    }
080}