package org.codehaus.plexus.interpolation.fixed;

/*
 * Copyright 2014 The Codehaus Foundation.
 *
 * 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.
 */

import org.codehaus.plexus.interpolation.reflection.ReflectionValueExtractor;

/**
 * Wraps an object, providing reflective access to the object graph of which the
 * supplied object is the root. Expressions like 'child.name' will translate into
 * 'rootObject.getChild().getName()' for non-boolean properties, and
 * 'rootObject.getChild().isName()' for boolean properties.
 */
public class ObjectBasedValueSource implements FixedValueSource {

    private final Object root;

    /**
     * Construct a new value source, using the supplied object as the root from
     * which to start, and using expressions split at the dot ('.') to navigate
     * the object graph beneath this root.
     * @param root The root of the graph.
     */
    public ObjectBasedValueSource(Object root) {
        this.root = root;
    }

    /**
     * Split the expression into parts, tokenized on the dot ('.') character. Then,
     * starting at the root object contained in this value source, apply each part
     * to the object graph below this root, using either 'getXXX()' or 'isXXX()'
     * accessor types to resolve the value for each successive expression part.
     * Finally, return the result of the last expression part's resolution.
     * <p><b>NOTE:</b> The object-graph nagivation actually takes place via the
     * {@link org.codehaus.plexus.interpolation.reflection.ReflectionValueExtractor} class.</p>
     */
    public Object getValue(String expression, InterpolationState interpolationState) {
        if (expression == null || expression.trim().length() < 1) {
            return null;
        }

        try {
            return ReflectionValueExtractor.evaluate(expression, root, false);
        } catch (Exception e) {
            interpolationState.addFeedback("Failed to extract \'" + expression + "\' from: " + root, e);
        }

        return null;
    }
}
