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Permazen classes that map Java model classes onto the core API.

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/*
 * Copyright (C) 2015 Archie L. Cobbs. All rights reserved.
 */

package io.permazen;

import com.google.common.base.Converter;
import com.google.common.base.Preconditions;

import io.permazen.index.Index1;

/**
 * Converts {@link Index1}es.
 *
 * @param  value type of converted indexes
 * @param  target type of converted indexes
 * @param  value type of unconverted (wrapped) indexes
 * @param  target type of unconverted (wrapped) indexes
 */
class Index1Converter extends Converter, Index1> {

    private final Converter valueConverter;
    private final Converter targetConverter;

    Index1Converter(Converter valueConverter, Converter targetConverter) {
        Preconditions.checkArgument(valueConverter != null, "null valueConverter");
        Preconditions.checkArgument(targetConverter != null, "null targetConverter");
        this.valueConverter = valueConverter;
        this.targetConverter = targetConverter;
    }

    @Override
    protected Index1 doForward(Index1 index) {
        if (index == null)
            return null;
        return new ConvertedIndex1(index, this.valueConverter.reverse(), this.targetConverter.reverse());
    }

    @Override
    protected Index1 doBackward(Index1 index) {
        if (index == null)
            return null;
        return new ConvertedIndex1<>(index, this.valueConverter, this.targetConverter);
    }

// Object

    @Override
    public boolean equals(Object obj) {
        if (obj == this)
            return true;
        if (obj == null || obj.getClass() != this.getClass())
            return false;
        final Index1Converter that = (Index1Converter)obj;
        return this.valueConverter.equals(that.valueConverter) && this.targetConverter.equals(that.targetConverter);
    }

    @Override
    public int hashCode() {
        return this.getClass().hashCode()
          ^ this.valueConverter.hashCode()
          ^ this.targetConverter.hashCode();
    }

    @Override
    public String toString() {
        return this.getClass().getSimpleName() + "[valueConverter=" + this.valueConverter
          + ",targetConverter=" + this.targetConverter + "]";
    }
}