/*
* 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.isis.viewer.wicket.viewer.services;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Path;
import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;
import javax.servlet.ServletContext;
import com.google.common.base.Charsets;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.io.CharSource;
import com.google.common.io.Files;
import com.google.common.io.Resources;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.isis.applib.annotation.DomainService;
import org.apache.isis.applib.annotation.NatureOfService;
import org.apache.isis.applib.annotation.Programmatic;
import org.apache.isis.applib.services.i18n.TranslationsResolver;
import org.apache.isis.core.webapp.WebAppConstants;
import org.apache.isis.viewer.wicket.viewer.IsisWicketApplication;
/**
* An implementation that reads from /WEB-INF/...
*/
@DomainService(
nature = NatureOfService.DOMAIN,
menuOrder = "" + Integer.MAX_VALUE
)
public class TranslationsResolverWicket implements TranslationsResolver {
public static Logger LOG = LoggerFactory.getLogger(TranslationsResolverWicket.class);
@Override
@Programmatic
public List<String> readLines(final String file) {
final ServletContext servletContext = getServletContext();
final String configLocation = servletContext.getInitParameter(WebAppConstants.CONFIG_DIR_PARAM);
try {
if(configLocation != null) {
LOG.info( "Reading translations relative to config override location: " + configLocation );
return Files.readLines(newFile(configLocation, file), Charsets.UTF_8);
} else {
final URL url = servletContext.getResource("/WEB-INF/" + file);
return readLines(url);
}
} catch (final RuntimeException | IOException ignored) {
return null;
}
}
static File newFile(final String dir, final String file) {
final File base = new File(dir);
final Path path = base.toPath();
final Path resolve = path.resolve(file);
return resolve.toFile();
}
protected ServletContext getServletContext() {
return getIsisWicketApplication().getServletContext();
}
private static final Pattern nonEmpty = Pattern.compile("^(#:|msgid|msgstr).+$");
private static List<String> readLines(final URL url) throws IOException {
if(url == null) {
return null;
}
final CharSource charSource = Resources.asCharSource(url, Charsets.UTF_8);
final ImmutableList<String> strings = charSource.readLines();
return Collections.unmodifiableList(
Lists.newArrayList(
Iterables.filter(strings, new Predicate<String>() {
@Override
public boolean apply(final String input) {
return input != null && nonEmpty.matcher(input).matches();
}
})));
}
protected IsisWicketApplication getIsisWicketApplication() {
return IsisWicketApplication.get();
}
}