/*
 * #!
 * Ontopia Engine
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * Licensed 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 net.ontopia.topicmaps.impl.utils;

import java.util.ArrayList;
import java.util.List;

/**
 * INTERNAL: Represents one argument in the signature checked by
 * ArgumentValidator.
 */
public class Argument {
  private List<Class<?>> types;
  private boolean optional;
  private boolean repeatable;
  private boolean mustBeBound;
  private boolean multiValue;

  public Argument() {
    types = new ArrayList<Class<?>>();
  }

  public void addType(Class<?> type) {
    types.add(type);
  }

  public Class<?>[] getTypes() {
    Class<?>[] a = new Class<?>[types.size()];
    for (int ix = 0; ix < a.length; ix++)
      a[ix] = types.get(ix);
    return a;
  }

  public void setOptional() {
    optional = true;
  }

  public void setRepeatable() {
    repeatable = true;
  }

  public void setMustBeBound() {
    mustBeBound = true;
  }
  
  public void setMultiValue() {
    multiValue = true;
  }
  
  public boolean isOptional() {
    return optional;
  }

  public boolean isRepeatable() {
    return repeatable;
  }

  public boolean isMultiValue() {
    return multiValue;
  }
  
  public boolean mustBeBound() {
    return mustBeBound;
  }

  public boolean allows(Class<?> type) {
    for (int ix = 0; ix < types.size(); ix++) {
      Class<?> required = types.get(ix);
      if (required.isAssignableFrom(type))
        return true;
    }
    return false;
  }
    
  public boolean requires(Class<?> type) {
    return types.size() == 1 && type.equals(types.get(0));
  }
}