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OPS4J Base - Utilities/Extensions related to sytem/configuration properties.

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/*
 * Copyright 2007 Alin Dreghiciu.
 *
 * 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.ops4j.util.property;

import java.util.HashMap;
import java.util.Map;

/**
 * A simple generics based property store.
 *
 * @author Alin Dreghiciu
 * @since August 26, 2007
 */
public class PropertyStore
{

    /**
     * Map of properties.
     */
    private Map m_properties;

    /**
     * Creates a new configuration map.
     */
    public PropertyStore()
    {
        m_properties = new HashMap();
    }

    /**
     * Returns true if the the property was set.
     *
     * @param propertyName name of the property
     *
     * @return true if property is set
     */
    public boolean contains( final String propertyName )
    {
        return m_properties.containsKey( propertyName );
    }

    /**
     * Sets a property.
     *
     * @param propertyName  name of the property to set
     * @param propertyValue value of the property to set
     *
     * @return the value of property set (fluent api)
     */
    public  T set( final String propertyName, final T propertyValue )
    {
        m_properties.put( propertyName, propertyValue );
        return propertyValue;
    }

    /**
     * Returns the property by name.
     *
     * @param propertyName name of the property
     *
     * @return property value
     */
    @SuppressWarnings( "unchecked" )
    public  T get( final String propertyName )
    {
        return (T) m_properties.get( propertyName );
    }

}