/*
    * Copyright 2011 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php
    *
   * 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.kuali.rice.krms.framework;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.commons.lang.ArrayUtils;
  import org.kuali.rice.krms.api.engine.TermResolver;
  import org.kuali.rice.krms.api.engine.TermSpecification;
  
  /**
   * Cheesy {@link TermResolver} implementation for testing purposes.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   *
   */
  public class TermResolverMock<T> implements TermResolver<T> {
  	
  	private T result;
  	private TermSpecification outputTermSpec;
  	private Set<String> params;
  	
  	public TermResolverMock(TermSpecification outputTermSpec, T result) {
  		this(outputTermSpec, null, result);
  	}
  	
  	public TermResolverMock(TermSpecification outputTerm, String [] params, T result) {
  		this.outputTermSpec = outputTerm;
  		this.result = result;
  		if (ArrayUtils.isEmpty(params)) {
  			this.params = Collections.emptySet(); 
  		} else {
  			this.params = Collections.unmodifiableSet(new HashSet<String>(Arrays.asList(params)));
  		}
  	}
  	
  	@Override
  	public int getCost() { return 1; }
  	
  	@Override
  	public TermSpecification getOutput() { return outputTermSpec; }
  	
  	@Override
  	public Set<TermSpecification> getPrerequisites() { return Collections.emptySet(); }
  	
  	@Override
  	public Set<String> getParameterNames() {
  		return params;
  	}
  	
  	@Override
  	public T resolve(Map<TermSpecification, Object> resolvedPrereqs, Map<String, String> parameters) {
  		return result;
  	}
  };