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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.el;

import org.camunda.bpm.engine.delegate.VariableScope;
import org.camunda.bpm.engine.impl.core.variable.mapping.IoParameter;
import org.camunda.bpm.engine.impl.core.variable.mapping.value.ParameterValueProvider;
import org.camunda.commons.utils.EnsureUtil;

/**
 * Makes it possible to use expression in {@link IoParameter} mappings.
 *
 * @author Daniel Meyer
 *
 */
public class ElValueProvider implements ParameterValueProvider, Comparable {

  protected Expression expression;

  public ElValueProvider(Expression expression) {
    this.expression = expression;
  }

  public Object getValue(VariableScope variableScope) {
    EnsureUtil.ensureNotNull("variableScope", variableScope);
    return expression.getValue(variableScope);
  }

  public Expression getExpression() {
    return expression;
  }

  public void setExpression(Expression expression) {
    this.expression = expression;
  }

  @Override
  public int compareTo(ElValueProvider o) {
    return expression.getExpressionText().compareTo(o.getExpression().getExpressionText());
  }

  @Override
  public boolean isDynamic() {
    return !getExpression().isLiteralText();
  }
}