common/src/main/java/org/apache/cxf/dosgi/common/util/PropertyHelper.java

/**
 * 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.cxf.dosgi.common.util;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class PropertyHelper {

    public static final Logger LOG = LoggerFactory.getLogger(PropertyHelper.class);

    private PropertyHelper() {
    }

    @SuppressWarnings("unchecked")
    public static Collection<String> getMultiValueProperty(Object property) {
        if (property == null) {
            return Collections.emptyList();
        } else if (property instanceof Collection) {
            return (Collection<String>)property;
        } else if (property instanceof String[]) {
            return Arrays.asList((String[])property);
        } else {
            return Collections.singleton(property.toString());
        }
    }

    public static String getProperty(Map<String, Object> dict, String name) {
        Object value = dict.get(name);
        return value instanceof String ? (String) value : null;
    }

    public static String getFirstNonEmptyStringProperty(Map<String, Object> dict, String ... keys) {
        for (String key : keys) {
            String value = getProperty(dict, key);
            if (value != null) {
                return value;
            }
        }
        return null;
    }

}