org.apache.shindig.social.opensocial.model.EnumUtil.java Source code

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Here is the source code for org.apache.shindig.social.opensocial.model.EnumUtil.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.shindig.social.opensocial.model;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;

import java.util.Set;

/**
 * Utility class for OpenSocial enums.
 */
public final class EnumUtil {

    /**
     * This is a utility class and can't be constructed.
     */
    private EnumUtil() {

    }

    /**
     *
     * @param vals array of enums
     * @return a set of the names for a list of Enum values defined by toString
     */
    // TODO: Because we have a Enum interface in this package we have to explicitly state the java.lang.Enum (bad ?)
    public static Set<String> getEnumStrings(java.lang.Enum<?>... vals) {
        ImmutableSet.Builder<String> builder = ImmutableSet.builder();
        for (java.lang.Enum<?> v : vals) {
            builder.add(v.toString());
        }
        Set<String> result = builder.build();

        Preconditions.checkArgument(result.size() == vals.length, "Enum names are not disjoint set");
        return result;
    }
}