/*
 * Copyright (c) 2011, 2021 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 v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation
//     11/19/2012-2.5 Guy Pelletier
//       - 389090: JPA 2.1 DDL Generation Support (foreign key metadata support)
package org.eclipse.persistence.internal.jpa.metadata.cache;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.persistence.descriptors.CacheIndex;
import org.eclipse.persistence.internal.helper.DatabaseField;
import org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor;
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 cache index metadata.
 *
 * 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 James Sutherland
 * @since EclipseLink 2.2
 */
public class CacheIndexMetadata extends ORMetadata {

    private List<String> m_columnNames = new ArrayList<>();
    private Boolean updateable;

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public CacheIndexMetadata() {
        super("<cache-index>");
    }

    /**
     * INTERNAL:
     */
    public CacheIndexMetadata(MetadataAnnotation index, MetadataAccessor accessor) {
        super(index, accessor);

        if (index != null) {
            for (Object columnName : index.getAttributeArray("columnNames")) {
                m_columnNames.add((String) columnName);
            }

            this.updateable = index.getAttributeBooleanDefaultTrue("updateable");
        }
    }

    /**
     * INTERNAL:
     */
    @Override
    public boolean equals(Object objectToCompare) {
        if (objectToCompare instanceof CacheIndexMetadata) {
            CacheIndexMetadata index = (CacheIndexMetadata) objectToCompare;
            if (this.updateable != index.getUpdateable()) {
                return false;
            }

            return this.m_columnNames.equals(index.getColumnNames());
        }

        return false;
    }

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

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public List<String> getColumnNames() {
        return m_columnNames;
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public Boolean getUpdateable() {
        return updateable;
    }

    /**
     * INTERNAL:
     * Process the index metadata
     */
    public void process(MetadataDescriptor descriptor, String defaultColumnName) {
        CacheIndex index = new CacheIndex();
        if (m_columnNames.isEmpty() && (defaultColumnName != null)) {
            index.addField(getField(defaultColumnName));
        } else {
            for (String column : m_columnNames) {
                index.addField(getField(column));
            }
        }
        if (this.updateable != null) {
            index.setIsUpdateable(this.updateable);
        }
        descriptor.getClassDescriptor().getCachePolicy().addCacheIndex(index);
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public void setColumnNames(List<String> columnNames) {
        this.m_columnNames = columnNames;
    }

    /**
     * INTERNAL:
     * Used for OX mapping.
     */
    public void setUpdateable(Boolean updateable) {
        this.updateable = updateable;
    }

    private DatabaseField getField(String name) {
        DatabaseField field = new DatabaseField(name);
        if (m_project.useDelimitedIdentifier()) {
            field.setUseDelimiters(true);
        } else if (m_project.getShouldForceFieldNamesToUpperCase() && !field.shouldUseDelimiters()) {
            field.useUpperCaseForComparisons(true);
        }
        return field;
    }
}