/*-
    * #%L
    * prolobjectlink-jpi-jpl7
    * %%
    * Copyright (C) 2020 - 2021 Prolobjectlink Project
    * %%
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions are met:
    * 
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. 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.
   * 
   * 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 HOLDERS 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.
   * #L%
   */
  package io.github.prolobjectlink.prolog.jpl7;
  
  import java.util.Map.Entry;
  
  import io.github.prolobjectlink.prolog.AbstractCompounds;
  import io.github.prolobjectlink.prolog.PrologEntry;
  import io.github.prolobjectlink.prolog.PrologProvider;
  import io.github.prolobjectlink.prolog.PrologTerm;
  import io.github.prolobjectlink.prolog.PrologTermType;
  
  /**
   * PrologEntry is key-value pair of PrologTerm. Is an implementation of
   * {@link Entry} and {@link PrologTerm}.
   * 
   * @author Jose Zalacain
   * @since 1.1
   */
  public final class JplEntry extends AbstractCompounds implements PrologEntry {
  
  	private final PrologTerm key;
  	private PrologTerm value;
  
  	JplEntry(PrologProvider provider, PrologTerm key, PrologTerm value) {
  		super(PrologTermType.MAP_ENTRY_TYPE, provider);
  		this.value = value;
  		this.key = key;
  	}
  
  	public PrologTerm getKey() {
  		return key;
  	}
  
  	public PrologTerm getValue() {
  		return value;
  	}
  
  	public PrologTerm setValue(PrologTerm value) {
  		this.value = value;
  		return value;
  	}
  
  	public boolean isList() {
  		return false;
  	}
  
  	public boolean isStructure() {
  		return true;
  	}
  
  	public boolean isEmptyList() {
  		return false;
  	}
  
  	public String getFunctor() {
  		return "-";
  	}
  
  	public int getArity() {
  		return 2;
  	}
  
  	public PrologTerm[] getArguments() {
  		return new PrologTerm[] { key, value };
  	}
  
  	@Override
  	public int hashCode() {
  		int result = 0;
  		final int prime = 31;
  		result = prime * result + ((key == null) ? 0 : key.hashCode());
  		result = prime * result + ((value == null) ? 0 : value.hashCode());
 		return result;
 	}
 
 	@Override
 	public boolean equals(Object obj) {
 		if (this == obj)
 			return true;
 		if (obj == null)
 			return false;
 		if (getClass() != obj.getClass())
 			return false;
 		JplEntry other = (JplEntry) obj;
 		if (key == null) {
 			if (other.key != null)
 				return false;
 		} else if (!key.equals(other.key)) {
 			return false;
 		}
 		if (value == null) {
 			if (other.value != null)
 				return false;
 		} else if (!value.equals(other.value)) {
 			return false;
 		}
 		return true;
 	}
 
 	@Override
 	public String toString() {
 		return "" + key + "-" + value + "";
 	}
 
 }