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/**
 * DataCleaner (community edition)
 * Copyright (C) 2014 Free Software Foundation, Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.datacleaner.data;

import org.apache.metamodel.schema.Column;
import org.datacleaner.api.InputColumn;
import org.datacleaner.util.InputColumnComparator;

public abstract class AbstractInputColumn implements InputColumn {

    private static final long serialVersionUID = 1L;

    @Override
    public boolean isPhysicalColumn() {
        return getPhysicalColumnInternal() != null;
    }

    @Override
    public boolean isVirtualColumn() {
        return getPhysicalColumnInternal() == null;
    }

    @Override
    public Column getPhysicalColumn() throws IllegalStateException {
        if (!isPhysicalColumn()) {
            throw new IllegalStateException(this + " is not a physical InputColumn");
        }
        return getPhysicalColumnInternal();
    }

    protected abstract Column getPhysicalColumnInternal();

    protected abstract int hashCodeInternal();

    protected abstract boolean equalsInternal(AbstractInputColumn that);

    @Override
    public final int compareTo(final InputColumn o) {
        return InputColumnComparator.compareInputColumns(this, o);
    }

    @Override
    public int hashCode() {
        return getClass().hashCode() + hashCodeInternal();
    }

    @Override
    public boolean equals(final Object obj) {
        if (obj == null) {
            return false;
        }
        if (obj == this) {
            return true;
        }
        if (obj.getClass() == this.getClass()) {
            final AbstractInputColumn that = (AbstractInputColumn) obj;
            if (that.getDataType() == this.getDataType()) {
                if (that.isPhysicalColumn() == this.isPhysicalColumn()) {
                    return equalsInternal(that);
                }
            }
        }
        return false;
    }
}