com.google.gxp.compiler.base.MultiLanguageAttrValue.java Source code

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Here is the source code for com.google.gxp.compiler.base.MultiLanguageAttrValue.java

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/*
 * Copyright (C) 2008 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.gxp.compiler.base;

import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

import java.io.Serializable;
import java.util.Map;
import java.util.regex.Pattern;

/**
 * An attribute that can be specified with varying language namespace prefixes
 * to indicated that different values should be used for different
 * {@code OutputLanguage}s.
 */
@SuppressWarnings("serial") // let java pick the SerialVersionUID
public class MultiLanguageAttrValue implements Serializable {
    private final ImmutableMap<OutputLanguage, String> map;
    private final String defaultValue;

    public MultiLanguageAttrValue(Map<OutputLanguage, String> map, String defaultValue) {
        this.map = ImmutableMap.copyOf(map);
        this.defaultValue = defaultValue;
    }

    public MultiLanguageAttrValue(String defaultValue) {
        this(ImmutableMap.<OutputLanguage, String>of(), Preconditions.checkNotNull(defaultValue));
    }

    public String get(OutputLanguage outputLanguage) {
        return map.containsKey(outputLanguage) ? map.get(outputLanguage) : defaultValue;
    }

    public String getDefault() {
        return defaultValue;
    }

    public boolean isEmpty() {
        return map.isEmpty() && (defaultValue == null);
    }

    private static final Pattern TRIVIAL_EVAL = Pattern.compile("\\w+");

    public boolean isTrivialEval() {
        return map.isEmpty() && defaultValue != null && TRIVIAL_EVAL.matcher(defaultValue).matches();
    }

    @Override
    public boolean equals(Object that) {
        return this == that || ((that instanceof MultiLanguageAttrValue) && equals((MultiLanguageAttrValue) that));
    }

    public boolean equals(MultiLanguageAttrValue that) {
        return Objects.equal(map, that.map) && Objects.equal(defaultValue, that.defaultValue);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(map, defaultValue);
    }
}