001// Copyright 2004, 2005 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.hivemind.schema.rules;
016
017import java.util.Map;
018
019import org.apache.hivemind.ApplicationRuntimeException;
020import org.apache.hivemind.HiveMind;
021import org.apache.hivemind.Location;
022import org.apache.hivemind.internal.Module;
023import org.apache.hivemind.schema.Translator;
024
025/**
026 * Translates strings to integer values.
027 *
028 * @author Howard Lewis Ship
029 */
030public class IntTranslator implements Translator
031{
032    private int _minValue;
033    private boolean _isMinValue;
034    private int _maxValue;
035    private boolean _isMaxValue;
036    private int _defaultValue = 0;
037
038    public IntTranslator()
039    {
040    }
041
042    /**
043     * Initializers:
044     * <ul>
045     * <li>default: default value for empty or invalid input
046     * <li>min: minimum acceptible value
047     * <li>max: maximum acceptible value
048     * </ul>
049     */
050    public IntTranslator(String initializer)
051    {
052        Map m = RuleUtils.convertInitializer(initializer);
053
054        String defaultInit = (String) m.get("default");
055
056        if (defaultInit != null)
057            _defaultValue = Integer.parseInt(defaultInit);
058
059        String minInit = (String) m.get("min");
060        if (minInit != null)
061        {
062            _isMinValue = true;
063            _minValue = Integer.parseInt(minInit);
064        }
065
066        String maxInit = (String) m.get("max");
067        if (maxInit != null)
068        {
069            _isMaxValue = true;
070            _maxValue = Integer.parseInt(maxInit);
071        }
072    }
073
074    /**
075     * Converts the string to an Integer.  The empty string is returned as zero.
076     * On failure, an error is logged and the method returns zero.
077     */
078    public Object translate(
079        Module contributingModule,
080        Class propertyType,
081        String inputValue,
082        Location location)
083    {
084        if (HiveMind.isBlank(inputValue))
085            return new Integer(_defaultValue);
086
087        int value;
088
089        try
090        {
091            value = Integer.parseInt(inputValue);
092        }
093        catch (Exception ex)
094        {
095            throw new ApplicationRuntimeException(
096                RulesMessages.invalidIntValue(inputValue),
097                location,
098                null);
099        }
100
101        if (_isMinValue && value < _minValue)
102            throw new ApplicationRuntimeException(RulesMessages.minIntValue(inputValue, _minValue));
103
104        if (_isMaxValue && value > _maxValue)
105            throw new ApplicationRuntimeException(RulesMessages.maxIntValue(inputValue, _maxValue));
106
107        return new Integer(value);
108    }
109
110}