/*
* Copyright 2013 Martin Kouba
*
* 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 org.trimou.engine.interpolation;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.trimou.engine.config.AbstractConfigurationAware;
import org.trimou.util.Iterables;
import org.trimou.util.Strings;
/**
* The default {@link KeySplitter} implementation which follows the dot
* notation.
*
* @author Martin Kouba
*/
public class DotKeySplitter extends AbstractConfigurationAware
implements KeySplitter {
@Override
public Iterator<String> split(String key) {
if (key.equals(Strings.DOT) || key.equals(Strings.THIS)
|| !key.contains(Strings.DOT)) {
return Iterables.singletonIterator(key);
}
boolean separator = false;
List<String> parts = new ArrayList<>();
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < key.length(); i++) {
if (isSeparator(key.charAt(i))) {
// Adjacent separators are ignored
if (!separator) {
if (buffer.length() > 0) {
parts.add(buffer.toString());
buffer = new StringBuilder();
}
separator = true;
}
} else {
buffer.append(key.charAt(i));
separator = false;
}
}
if (buffer.length() > 0) {
parts.add(buffer.toString());
}
return parts.iterator();
}
protected boolean isSeparator(char candidate) {
return candidate == '.';
}
}