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

Introduction

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

Source

/*
 * 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.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.gxp.compiler.alerts.AlertSink;
import com.google.gxp.compiler.alerts.common.InvalidMessageError;
import com.google.transconsole.common.messages.InvalidMessageBundleException;
import com.google.transconsole.common.messages.MessageBundle;

import java.util.*;

/**
 * Utility functions for things that are done frequently in the GXP compiler.
 */
public class Util {
    private Util() {
        throw new AssertionError("Don't instantiate me!");
    }

    /**
     * Given a function and a list, returns a list such that each element of the
     * result is the corresponding element of the input list mapped through the
     * input function.  Unlike Lists.transform the result is <em>not</em> a lazy
     * view, and null elements in the result are disallowed.  This is very
     * similar to the map function in Python and Scheme, except the parameters
     * are reversed for consistency with Lists.transform.
     *
     * @throws NullPointerException if any of resulting elements would be null.
     */
    public static <K, V> ImmutableList<V> map(List<K> fromList, Function<? super K, ? extends V> function) {
        return ImmutableList.copyOf(Lists.transform(fromList, function));
    }

    // TODO(laurence): don't hardcode these. They currently don't do anything
    // except stop NullPointerExceptions, but these are reasonable defaults for
    // when they actually do something. "AdWordsSelect" is the name of the
    // "shared" translation console project for, er... historical reasons.
    private static final String PROJECT_ID = "AdWordsSelect";
    private static final String LANGUAGE_ID = "en-US";

    /**
     * Build a {@code MessageBundle} from a {@code List} of {@code ExtractedMessage}s.
     */
    public static MessageBundle bundleMessages(AlertSink alertSink, List<ExtractedMessage> messages) {
        MessageBundle messageBundle = new MessageBundle(PROJECT_ID, LANGUAGE_ID);
        for (ExtractedMessage msg : messages) {
            try {
                messageBundle.addMessage(msg.getTcMessage());
            } catch (InvalidMessageBundleException e) {
                alertSink.add(new InvalidMessageError(msg.getSourcePosition(), e.getCause()));
            }
        }
        return messageBundle;
    }
}