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/*
 * #%L
 * Protempa Framework
 * %%
 * Copyright (C) 2012 - 2013 Emory University
 * %%
 * 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.
 * #L%
 */
package org.protempa.proposition.value;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.text.Format;
import java.util.List;
import java.util.Objects;

import org.apache.commons.lang3.builder.ToStringBuilder;

/**
 * Represents ordinal string values. This currently is non-functional.
 * 
 * @author Andrew Post
 */
public final class OrdinalValue implements OrderedValue, Serializable {

    private static final long serialVersionUID = -1605459658420554439L;
    private String val;
    private int index;
    private transient volatile int hashCode;
    
    /**
     * Creates an ordinal value of a type with allowed values.
     *
     * @param value
     *            a {@link String}.
     * @param sortedAllowedValues
     *            the allowed values {@link List 0) {
                    return ValueComparator.GREATER_THAN;
                } else {
                    return ValueComparator.LESS_THAN;
                }
            case VALUELIST:
                ValueList vl = (ValueList) o;
                return equals(vl) ? ValueComparator.EQUAL_TO 
                        : ValueComparator.NOT_EQUAL_TO;
            default:
                return ValueComparator.NOT_EQUAL_TO;
        }
    }
    
    @Override
    public int hashCode() {
        int hash = 3;
        hash = 67 * hash + Objects.hashCode(this.val);
        hash = 67 * hash + this.index;
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final OrdinalValue other = (OrdinalValue) obj;
        if (!Objects.equals(this.val, other.val)) {
            return false;
        }
        if (this.index != other.index) {
            return false;
        }
        return true;
    }
    
    @Override
    public void accept(ValueVisitor valueVisitor) {
        if (valueVisitor == null) {
            throw new IllegalArgumentException("valueVisitor cannot be null");
        }
        valueVisitor.visit(this);
    }
    
    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this);
    }
    
    private void writeObject(ObjectOutputStream s) throws IOException {
        s.writeObject(this.val);
        s.writeInt(this.index);
    }
    
    private void readObject(ObjectInputStream s) throws IOException,
            ClassNotFoundException {
        this.val = (String) s.readObject();
        this.index = s.readInt();
    }

    @Override
    public OrdinalValueBuilder asBuilder() {
        return new OrdinalValueBuilder(this);
    }
}