001/*
002 * #%L
003 * GwtBootstrap3
004 * %%
005 * Copyright (C) 2015 GwtBootstrap3
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 * 
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 * 
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package gwt.material.design.client.base.validator;
021
022import gwt.material.design.client.base.validator.ValidationMessages.Keys;
023
024import java.util.Collection;
025import java.util.Map;
026
027/**
028 * Validator for checking the length of a map, array, collection, or string value. If type is not one of the
029 * aformentioned, the {@link Object#toString()} method is called to get the string representation of the
030 * object.
031 *
032 * @param <T> the generic type
033 * @author Steven Jardine
034 */
035public class SizeValidator<T> extends AbstractValidator<T> {
036
037    private Integer maxValue;
038
039    private Integer minValue;
040
041    public SizeValidator(Integer min, Integer max) {
042        super(Keys.SIZE, new Object[]{min, max});
043        setMin(min);
044        setMax(max);
045    }
046
047    public SizeValidator(Integer min, Integer max, String invalidMessageOverride) {
048        super(invalidMessageOverride);
049        setMin(min);
050        setMax(max);
051    }
052
053    @Override
054    public int getPriority() {
055        return Priority.MEDIUM;
056    }
057
058    @Override
059    public boolean isValid(T value) {
060        int length = 0;
061        if (value instanceof Map<?, ?>) {
062            length = ((Map<?, ?>) value).size();
063        } else if (value instanceof Collection<?>) {
064            length = ((Collection<?>) value).size();
065        } else if (value instanceof Object[]) {
066            length = ((Object[]) value).length;
067        } else if (value != null) {
068            length = value.toString().length();
069        }
070        return length >= minValue && length <= maxValue;
071    }
072
073    /**
074     * @param max the max to set
075     */
076    public void setMax(Integer max) {
077        this.maxValue = max;
078        assert maxValue > 0;
079    }
080
081    /**
082     * @param min the min to set
083     */
084    public void setMin(Integer min) {
085        minValue = min;
086        if (minValue == null || minValue < 0) {
087            minValue = 0;
088        }
089    }
090}