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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
 * 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.
 */

import java.util.List;

/**
 * Wraps an arbitrary object with an {@link ObjectBasedValueSource} instance, then
 * wraps that source with a {@link PrefixedValueSourceWrapper} instance, to which
 * this class delegates all of its calls.
 *
 */
public class PrefixedObjectValueSource
    extends AbstractDelegatingValueSource
    implements QueryEnabledValueSource
{

    /**
     * Wrap the specified root object, allowing the specified expression prefix.
     * @param prefix the prefix.
     * @param root the root of the graph.
     */
    public PrefixedObjectValueSource( String prefix, Object root )
    {
        super( new PrefixedValueSourceWrapper( new ObjectBasedValueSource( root ), prefix ) );
    }

    /**
     * Wrap the specified root object, allowing the specified list of expression
     * prefixes and setting whether the {@link PrefixedValueSourceWrapper} allows
     * unprefixed expressions.
     * @param possiblePrefixes The possible prefixes.
     * @param root The root of the graph.
     * @param allowUnprefixedExpressions if we allow undefined expressions or not.
     */
    public PrefixedObjectValueSource( List possiblePrefixes, Object root, boolean allowUnprefixedExpressions )
    {
        super( new PrefixedValueSourceWrapper( new ObjectBasedValueSource( root ), possiblePrefixes,
                                               allowUnprefixedExpressions ) );
    }

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