/*
* Copyright 2008-2017 the original author or authors.
*
* 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 griffon.util;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.Set;
import static griffon.util.ConfigUtils.collectKeys;
import static griffon.util.ConfigUtils.getConfigValue;
import static griffon.util.GriffonNameUtils.requireNonBlank;
/**
* @author Andres Almiray
* @since 2.0.0
*/
public abstract class AbstractMapResourceBundle extends ResourceBundle {
protected final Map<String, Object> entries = new LinkedHashMap<>();
protected volatile Set<String> keys;
public AbstractMapResourceBundle() {
initialize(entries);
initializeKeys();
}
protected abstract void initialize(@Nonnull Map<String, Object> entries);
protected void initializeKeys() {
keys = collectKeys(entries);
}
@Nullable
@Override
protected final Object handleGetObject(@Nonnull String key) {
return getConfigValue(entries, requireNonBlank(key, "Argument 'key' must not be blank"));
}
@Nonnull
@Override
public final Enumeration<String> getKeys() {
return new IteratorAsEnumeration<>(keys.iterator());
}
@Override
public Set<String> keySet() {
return keys;
}
@Override
protected Set<String> handleKeySet() {
return keys;
}
private static class IteratorAsEnumeration<E> implements Enumeration<E> {
private final Iterator<E> iterator;
public IteratorAsEnumeration(Iterator<E> iterator) {
this.iterator = iterator;
}
public boolean hasMoreElements() {
return iterator.hasNext();
}
public E nextElement() {
return iterator.next();
}
}
}