QueryHintMetadata.java

/*******************************************************************************
 * Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
 *     05/16/2008-1.0M8 Guy Pelletier
 *       - 218084: Implement metadata merging functionality between mapping files
 *     04/27/2010-2.1 Guy Pelletier
 *       - 309856: MappedSuperclasses from XML are not being initialized properly
 *     03/24/2011-2.3 Guy Pelletier
 *       - 337323: Multi-tenant with shared schema support (part 1)
 ******************************************************************************/
package org.eclipse.persistence.internal.jpa.metadata.queries;

import org.eclipse.persistence.internal.jpa.metadata.ORMetadata;
import org.eclipse.persistence.internal.jpa.metadata.accessors.MetadataAccessor;
import org.eclipse.persistence.internal.jpa.metadata.accessors.objects.MetadataAnnotation;

/**
 * INTERNAL:
 * Object to hold onto query hints metadata. Use this object to preserve
 * information like multiples and order of specification. We lose that by
 * using a java hash object directly.
 *
 * Key notes:
 * - any metadata mapped from XML to this class must be compared in the
 *   equals method.
 * - when loading from annotations, the constructor accepts the metadata
 *   accessor this metadata was loaded from. Used it to look up any
 *   'companion' annotation needed for processing.
 * - methods should be preserved in alphabetical order.
 *
 * @author Guy Pelletier
 * @since TopLink EJB 3.0 Reference Implementation
 */
public class QueryHintMetadata extends ORMetadata {
    private String m_name;
    private String m_value;

    /**
     * INTERNAL:
     * Used for XML loading.
     */
    public QueryHintMetadata() {
        super("<hint>");
    }

    /**
     * INTERNAL:
     * Used for annotation loading.
     */
    public QueryHintMetadata(MetadataAnnotation hint, MetadataAccessor accessor) {
        super(hint, accessor);

        m_name = hint.getAttributeString("name");
        m_value = hint.getAttributeString("value");
    }

    /**
     * INTERNAL:
     */
    @Override
    public boolean equals(Object objectToCompare) {
        if (objectToCompare instanceof QueryHintMetadata) {
            QueryHintMetadata hint = (QueryHintMetadata) objectToCompare;

            if (! valuesMatch(m_name, hint.getName())) {
                return false;
            }

            return valuesMatch(m_value, hint.getValue());
        }

        return false;
    }

    @Override
    public int hashCode() {
        int result = m_name != null ? m_name.hashCode() : 0;
        result = 31 * result + (m_value != null ? m_value.hashCode() : 0);
        return result;
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public String getName() {
        return m_name;
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public String getValue() {
        return m_value;
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public void setName(String name) {
        m_name = name;
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public void setValue(String value) {
        m_value = value;
    }
}