ruta-core/src/main/java/org/apache/uima/ruta/expression/annotation/AnnotationVariableExpression.java

/*
 * 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.
 */

package org.apache.uima.ruta.expression.annotation;

import org.apache.uima.cas.text.AnnotationFS;
import org.apache.uima.ruta.RutaBlock;
import org.apache.uima.ruta.RutaStream;
import org.apache.uima.ruta.rule.MatchContext;

/**
 * An expression referring to an annotation stored in a variable.
 *
 */
public class AnnotationVariableExpression extends AbstractAnnotationExpression {

private String var;
  
  public AnnotationVariableExpression(String var) {
    super();
    this.var = var;
  }
  
  
  @Override
  public AnnotationFS getAnnotation(MatchContext context, RutaStream stream) {
    RutaBlock parent = context.getParent();
    AnnotationFS variableValue = parent.getEnvironment().getVariableValue(var, AnnotationFS.class);
    return variableValue;
  }


  public String getVar() {
    return var;
  }

}