com.google.gwt.core.ext.DefaultSelectionProperty.java Source code

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Here is the source code for com.google.gwt.core.ext.DefaultSelectionProperty.java

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/*
 * Copyright 2009 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.core.ext;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;

/**
 * Default immutable implementation of SelectionProperty that receives its
 * values in its constructor.
 */
public class DefaultSelectionProperty implements SelectionProperty {

    private final String currentValue;
    private final String fallbackValue;
    private final String name;
    private final SortedSet<String> possibleValues;
    private final Map<String, ? extends List<? extends Set<String>>> fallbackValueMap;

    /**
     * Construct a selection property.
     *  
     * @param currentValue current value of this property, must not be null
     * @param fallbackValue the fallback value to use, must not be null
     * @param name the name of this property, must not be null
     * @param possibleValues the set of possible values, must not be null and
     *     will be returned to callers, so a copy should be passed into this
     *     ctor if the caller will use this set later
     */
    public DefaultSelectionProperty(String currentValue, String fallbackValue, String name,
            SortedSet<String> possibleValues) {
        this(currentValue, fallbackValue, name, possibleValues, null);
    }

    /**
     * Construct a selection property.
     *  
     * @param currentValue current value of this property, must not be null
     * @param fallbackValue the fallback value to use, must not be null
     * @param name the name of this property, must not be null
     * @param possibleValues the set of possible values, must not be null and
     *     will be returned to callers, so a copy should be passed into this
     *     ctor if the caller will use this set later
     * @param fallbackValueMap the map propertyValue to fallback values
     */
    public DefaultSelectionProperty(String currentValue, String fallbackValue, String name,
            SortedSet<String> possibleValues, Map<String, ? extends List<? extends Set<String>>> fallbackValueMap) {
        assert currentValue != null;
        assert fallbackValue != null;
        assert name != null;
        assert possibleValues != null;
        this.currentValue = currentValue;
        this.fallbackValue = fallbackValue;
        this.name = name;
        this.possibleValues = possibleValues;
        this.fallbackValueMap = fallbackValueMap;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        DefaultSelectionProperty other = (DefaultSelectionProperty) obj;
        return currentValue.equals(other.currentValue) && fallbackValue.equals(other.fallbackValue)
                && name.equals(other.name) && possibleValues.equals(other.possibleValues);
    }

    public String getCurrentValue() {
        return currentValue;
    }

    public String getFallbackValue() {
        return fallbackValue;
    }

    public List<? extends Set<String>> getFallbackValues(String value) {
        return (null != fallbackValueMap) ? fallbackValueMap.get(value) : null;
    }

    public String getName() {
        return name;
    }

    public SortedSet<String> getPossibleValues() {
        return possibleValues;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + currentValue.hashCode();
        result = prime * result + fallbackValue.hashCode();
        result = prime * result + name.hashCode();
        result = prime * result + possibleValues.hashCode();
        return result;
    }

    @Override
    public String toString() {
        return "SelectionProp " + name + ": " + currentValue + " of " + possibleValues.toString() + ", fallback ="
                + fallbackValue;
    }
}