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/*
 * [New BSD License]
 * Copyright (c) 2011-2012, Brackit Project Team 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Brackit Project Team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package io.brackit.query.function.fn;

import io.brackit.query.atomic.Bool;
import io.brackit.query.atomic.QNm;
import io.brackit.query.jdm.Sequence;
import io.brackit.query.jdm.Signature;
import io.brackit.query.module.StaticContext;
import io.brackit.query.QueryContext;
import io.brackit.query.QueryException;
import io.brackit.query.function.AbstractFunction;

/**
 * @author Sebastian Baechle
 */
public class BooleanValue extends AbstractFunction {
  private final boolean not;

  public BooleanValue(QNm name, boolean not, Signature signature) {
    super(name, signature, true);
    this.not = not;
  }

  @Override
  public Sequence execute(StaticContext sctx, QueryContext ctx, Sequence[] args) throws QueryException {
    if (not) {
      if (args.length == 0) {
        if ("true".equals(getName().getLocalName())) {
          return Bool.FALSE;
        } else if ("false".equals(getName().getLocalName())) {
          return Bool.TRUE;
        }
      }
      return args[0] == null ? Bool.TRUE : args[0].booleanValue() ? Bool.FALSE : Bool.TRUE;
    } else {
      if (args.length == 0) {
        if ("false".equals(getName().getLocalName())) {
          return Bool.FALSE;
        } else if ("true".equals(getName().getLocalName())) {
          return Bool.TRUE;
        }
      }
      return args[0] == null ? Bool.FALSE : args[0].booleanValue() ? Bool.TRUE : Bool.FALSE;
    }
  }
}