/*
 * Copyright (C) 2004-2011
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.kohsuke.rngom.binary;

import org.kohsuke.rngom.binary.visitor.PatternFunction;
import org.kohsuke.rngom.binary.visitor.PatternVisitor;
import org.relaxng.datatype.Datatype;

public class ValuePattern extends StringPattern {
  Object obj;
  Datatype dt;

  ValuePattern(Datatype dt, Object obj) {
    super(combineHashCode(VALUE_HASH_CODE, obj.hashCode()));
    this.dt = dt;
    this.obj = obj;
  }

  boolean samePattern(Pattern other) {
    if (getClass() != other.getClass())
      return false;
    if (!(other instanceof ValuePattern))
      return false;
    return (dt.equals(((ValuePattern)other).dt)
	    && dt.sameValue(obj, ((ValuePattern)other).obj));
  }

  public void accept(PatternVisitor visitor) {
    visitor.visitValue(dt, obj);
  }

  public Object apply(PatternFunction f) {
    return f.caseValue(this);
  }

    @Override
  void checkRestrictions(int context, DuplicateAttributeDetector dad, Alphabet alpha)
    throws RestrictionViolationException {
    switch (context) {
    case START_CONTEXT:
      throw new RestrictionViolationException("start_contains_value");
    }
  }

  Datatype getDatatype() {
    return dt;
  }

  Object getValue() {
    return obj;
  }

}