trunk/ruta-core-ext/src/main/java/org/apache/uima/ruta/string/bool/IsEmptyBooleanFunction.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.string.bool;

import org.apache.uima.cas.text.AnnotationFS;
import org.apache.uima.ruta.RutaBlock;
import org.apache.uima.ruta.RutaStream;
import org.apache.uima.ruta.expression.bool.BooleanFunctionExpression;
import org.apache.uima.ruta.expression.string.IStringExpression;

public class IsEmptyBooleanFunction extends BooleanFunctionExpression {

  private IStringExpression text;

  public IsEmptyBooleanFunction(IStringExpression text) {
    this.text = text;
  }

  public IStringExpression getExpr() {
    return text;
  }

  @Override
  public boolean getBooleanValue(RutaBlock parent, AnnotationFS annotation, RutaStream stream) {
    return text.getStringValue(parent, annotation, stream).isEmpty();
  }

  @Override
  public String getStringValue(RutaBlock parent, AnnotationFS annotation, RutaStream stream) {
    Boolean isEmpty = text.getStringValue(parent, annotation, stream).isEmpty();
    return isEmpty.toString();
  }
}