/*
* Java Genetic Algorithm Library (@__identifier__@).
* Copyright (c) @__year__@ Franz Wilhelmstötter
*
* 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.
*
* Author:
* Franz Wilhelmstötter (franz.wilhelmstoetter@gmx.at)
*/
package org.jenetics.gradle;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
import static java.util.regex.Pattern.quote;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.gradle.api.GradleException;
import org.gradle.api.plugins.ExtraPropertiesExtension;
/**
* Reads user properties from an property file and writes it to the given
* {@code ExternalPropertiesExtension} object.
*
* @author <a href="mailto:franz.wilhelmstoetter@gmx.at">Franz Wilhelmstötter</a>
* @since 1.2
* @version 1.4 — <em>$Date$</em>
*/
public final class PropertiesLoader {
private final ExtraPropertiesExtension _ext;
public PropertiesLoader(final ExtraPropertiesExtension ext) {
_ext = requireNonNull(ext, "Properties must not be null.");
}
/**
* Loads the properties, stored in the given file, and writes it to the
* {@code ExternalPropertiesExtension} object.
*
* @param file the property file
*/
public void load(final File file) {
final Properties properties = new Properties();
try (final InputStream in = new FileInputStream(file)) {
properties.load(in);
} catch (IOException e) {
throw new GradleException(format(
"Error while reading propertie file '%s'", file), e
);
}
for (final Map.Entry<Object, Object> entry : properties.entrySet()) {
set(entry.getKey().toString(), entry.getValue());
}
}
private void set(final String key, final Object value) {
final String[] parts = key.split(quote("."));
if (parts.length == 1) {
_ext.set(key, value);
} else {
Map<String, Object> map = getOrElseCreateMap(parts[0]);
for (int i = 1; i < parts.length - 1; ++i) {
map = getOrElseCreateMap(map, parts[i]);
}
map.put(parts[parts.length - 1], value);
}
}
@SuppressWarnings("unchecked")
private Map<String, Object> getOrElseCreateMap(
final Map<String, Object> parent,
final String key
) {
Map<String, Object> map = (Map<String, Object>)parent.get(key);
if (map == null) {
map = new HashMap<>();
parent.put(key, map);
}
return map;
}
@SuppressWarnings("unchecked")
private Map<String, Object> getOrElseCreateMap(final String key) {
Map<String, Object> map = null;
if (_ext.has(key)) {
map = (Map<String, Object>)_ext.get(key);
} else {
map = new HashMap<>();
_ext.set(key, map);
}
return map;
}
}