org.codehaus.plexus.interpolation.fixed.ObjectBasedValueSource Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of spring-cloud-contract-shade Show documentation
Show all versions of spring-cloud-contract-shade Show documentation
Spring Cloud Contract Shaded Dependencies
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.
* NOTE: The object-graph nagivation actually takes place via the
* {@link org.codehaus.plexus.interpolation.reflection.ReflectionValueExtractor} class.
*/
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;
}
}