/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.core.transformer.simple;
import org.mule.runtime.api.metadata.DataType;
import org.mule.runtime.core.api.transformer.TransformerException;
import org.mule.runtime.api.i18n.I18nMessageFactory;
import org.mule.runtime.core.transformer.AbstractTransformer;
import java.nio.charset.Charset;
import java.util.Map;
/**
* <code>MapLookup</code> looks up and returns an object from a Map based on a key.
*/
public class MapLookup extends AbstractTransformer {
protected volatile Object key;
public MapLookup() {
registerSourceType(DataType.fromType(Map.class));
setReturnDataType(DataType.OBJECT);
}
@Override
public Object doTransform(Object src, Charset encoding) throws TransformerException {
if (src instanceof Map) {
if (key != null) {
return ((Map) src).get(key);
} else {
throw new TransformerException(I18nMessageFactory
.createStaticMessage("Property 'key' must be set in order to use this transformer."));
}
} else {
throw new TransformerException(I18nMessageFactory
.createStaticMessage("Message to transform must be of type java.util.Map"));
}
}
public Object getKey() {
return key;
}
public void setKey(Object key) {
this.key = key;
}
}