ConfigurationProperties.java

/*
 * 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.config;

import org.trimou.util.Strings;

/**
 *
 * @author Martin Kouba
 */
final class ConfigurationProperties {

    private ConfigurationProperties() {
    }

    /**
     * Build the property key for the given name and prefix parts. The name is
     * converted to CamelCase (underscore is used as a delimiter):
     *
     * <pre>
     * MY_PROPERTY_NAME
     * </pre>
     *
     * becomes
     *
     * <pre>
     * myPropertyName
     * </pre>
     *
     * @param propertyName
     * @param prefixParts
     * @return the key
     */
    static String buildPropertyKey(String propertyName, String[] prefixParts) {
        return buildPropertyKey(propertyName, Strings.UNDERSCORE, prefixParts);
    }

    /**
     * Build the property key for the given name and prefix parts. The name is
     * converted to CamelCase (using the specified delimiter; delimiters are
     * removed in the end).
     *
     * @param propertyName
     * @param delimiter
     * @param prefixParts
     * @return the key
     */
    static String buildPropertyKey(String propertyName, String delimiter,
            String[] prefixParts) {
        StringBuilder key = new StringBuilder();
        for (final String prefixPart : prefixParts) {
            key.append(prefixPart);
            key.append(Strings.DOT);
        }
        key.append(
                Strings.uncapitalize(
                        Strings.replace(
                                Strings.capitalizeFully(propertyName,
                                        delimiter.toCharArray()[0]),
                                delimiter, "")));
        return key.toString();
    }

    /**
     *
     * @param defaultValueType
     * @param value
     * @return the converted value
     */
    static Object convertConfigValue(Class<?> defaultValueType, Object value) {
        if (defaultValueType.equals(String.class)) {
            return value.toString();
        } else if (defaultValueType.equals(Boolean.class)) {
            return Boolean.valueOf(value.toString());
        } else if (defaultValueType.equals(Long.class)) {
            return Long.valueOf(value.toString());
        } else if (defaultValueType.equals(Integer.class)) {
            return Integer.valueOf(value.toString());
        }
        throw new IllegalStateException(
                "Unsupported default value type: " + defaultValueType);
    }

}