package org.codehaus.plexus.interpolation;

/*
 * 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
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 * 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
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 */

import java.util.List;
import java.util.Properties;

Legacy support. Allow trimming one of a set of expression prefixes, the lookup
the remaining expression as a literal key from the wrapped properties instance.
This is just a convenience implementation to provide a shorthand for constructing
the properties value source and then wrapping it with a prefixed value-source wrapper.
/**
 * Legacy support. Allow trimming one of a set of expression prefixes, the lookup
 * the remaining expression as a literal key from the wrapped properties instance.
 * <p>This is just a convenience implementation to provide a shorthand for constructing
 * the properties value source and then wrapping it with a prefixed value-source wrapper.</p>
 *
 */
public class PrefixedPropertiesValueSource
    extends AbstractDelegatingValueSource
    implements QueryEnabledValueSource
{

    
Wrap the specified properties file with a new PropertiesBasedValueSource, then wrap that source with a new PrefixedValueSourceWrapper that uses the specified expression prefix. Finally, set this wrapper source as a delegate for this instance to use. 
Params:
prefix –     The expression prefix to trim
properties – The properties instance to wrap/**
     * Wrap the specified properties file with a new {@link PropertiesBasedValueSource}, then
     * wrap that source with a new {@link PrefixedValueSourceWrapper} that uses the specified
     * expression prefix. Finally, set this wrapper source as a delegate for this
     * instance to use.
     *
     * @param prefix     The expression prefix to trim
     * @param properties The properties instance to wrap
     */
    public PrefixedPropertiesValueSource( String prefix, Properties properties )
    {
        super( new PrefixedValueSourceWrapper( new PropertiesBasedValueSource( properties ), prefix ) );
    }

    
Wrap the specified properties file with a new PropertiesBasedValueSource, then wrap that source with a new PrefixedValueSourceWrapper that uses the specified expression-prefix list. Finally, set this wrapper source as a delegate for this instance to use. 
Params:
possiblePrefixes – The expression-prefix list to trim
properties –       The properties instance to wrap
allowUnprefixedExpressions – allow unprefixed expressions or not./**
     * Wrap the specified properties file with a new {@link PropertiesBasedValueSource}, then
     * wrap that source with a new {@link PrefixedValueSourceWrapper} that uses the specified
     * expression-prefix list. Finally, set this wrapper source as a delegate for this
     * instance to use.
     *
     * @param possiblePrefixes The expression-prefix list to trim
     * @param properties       The properties instance to wrap
     * @param allowUnprefixedExpressions allow unprefixed expressions or not.
     */
    public PrefixedPropertiesValueSource( List<String> possiblePrefixes, Properties properties,
                                          boolean allowUnprefixedExpressions )
    {
        super( new PrefixedValueSourceWrapper( new PropertiesBasedValueSource( properties ), possiblePrefixes,
                                               allowUnprefixedExpressions ) );
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    public String getLastExpression()
    {
        return ( (QueryEnabledValueSource) getDelegate() ).getLastExpression();
    }

}