TupleTupleMarshalledBinding.java

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: TupleTupleMarshalledBinding.java,v 12.1 2005/01/31 19:27:32 mark Exp $
 */

package com.sleepycat.bind.tuple;

import com.sleepycat.util.RuntimeExceptionWrapper;

public class TupleTupleMarshalledBinding extends TupleTupleBinding {

    private Class cls;

    public TupleTupleMarshalledBinding(Class cls) {

        this.cls = cls;

        // The entity class will be used to instantiate the entity object.
        //
        if (!MarshalledTupleKeyEntity.class.isAssignableFrom(cls)) {
            throw new IllegalArgumentException(cls.toString() +
                        " does not implement MarshalledTupleKeyEntity");
        }
        if (!MarshalledTupleEntry.class.isAssignableFrom(cls)) {
            throw new IllegalArgumentException(cls.toString() +
                        " does not implement MarshalledTupleEntry");
        }
    }

    // javadoc is inherited
    public Object entryToObject(TupleInput keyInput, TupleInput dataInput) {

        // This "tricky" binding returns the stored data as the entity, but
        // first it sets the transient key fields from the stored key.
        MarshalledTupleEntry obj;
        try {
            obj = (MarshalledTupleEntry) cls.newInstance();
        } catch (IllegalAccessException e) {
            throw new RuntimeExceptionWrapper(e);
        } catch (InstantiationException e) {
            throw new RuntimeExceptionWrapper(e);
        }
        if (dataInput != null) { // may be null if used by key extractor
            obj.unmarshalEntry(dataInput);
        }
        MarshalledTupleKeyEntity entity = (MarshalledTupleKeyEntity) obj;
        if (keyInput != null) { // may be null if used by key extractor
            entity.unmarshalPrimaryKey(keyInput);
        }
        return entity;
    }

    // javadoc is inherited
    public void objectToKey(Object object, TupleOutput output) {

        MarshalledTupleKeyEntity entity = (MarshalledTupleKeyEntity) object;
        entity.marshalPrimaryKey(output);
    }

    // javadoc is inherited
    public void objectToData(Object object, TupleOutput output) {

        MarshalledTupleEntry entity = (MarshalledTupleEntry) object;
        entity.marshalEntry(output);
    }
}

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