/*
* 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;
}
}