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Berkeley DB Java Edition is a open source, transactional storage solution for Java applications. The Direct Persistence Layer (DPL) API is faster and easier to develop, deploy, and manage than serialized object files or ORM-based Java persistence solutions. The Collections API enhances the standard java.util.collections classes allowing them to be persisted to a local file system and accessed concurrently while protected by ACID transactions. Data is stored by serializing objects and managing class and instance data separately so as not to waste space. Berkeley DB Java Edition is the reliable drop-in solution for complex, fast, and scalable storage. Source for this release is in 'je-4.0.92-sources.jar', the Javadoc is located at 'http://download.oracle.com/berkeley-db/docs/je/4.0.92/'.

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/*-
 * Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This file was distributed by Oracle as part of a version of Oracle Berkeley
 * DB Java Edition made available at:
 *
 * http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
 *
 * Please see the LICENSE file included in the top-level directory of the
 * appropriate version of Oracle Berkeley DB Java Edition for a copy of the
 * license and additional information.
 */

package com.sleepycat.persist.model;

import java.io.Serializable;

/**
 * The metadata for a key field.  This class defines common properties for
 * singular and composite key fields.
 *
 * {@code FieldMetadata} objects are thread-safe.  Multiple threads may
 * safely call the methods of a shared {@code FieldMetadata} object.
 *
 * @author Mark Hayes
 */
public class FieldMetadata implements Serializable {

    private static final long serialVersionUID = -9037650229184174279L;

    private String name;
    private String className;
    private String declaringClassName;

    /**
     * Used by an {@code EntityModel} to construct field metadata.
     *
     * @param name the field name.
     * @param className the class name.
     * @param declaringClassName the name of the class where the field is
     * declared.
     */
    public FieldMetadata(String name,
                         String className,
                         String declaringClassName) {
        this.name = name;
        this.className = className;
        this.declaringClassName = declaringClassName;
    }

    /**
     * Returns the field name.
     *
     * @return the field name.
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the class name of the field type.
     *
     * @return the class name.
     */
    public String getClassName() {
        return className;
    }

    /**
     * Returns the name of the class where the field is declared.
     *
     * @return the name of the class where the field is declared.
     */
    public String getDeclaringClassName() {
        return declaringClassName;
    }

    @Override
    public boolean equals(Object other) {
        if (other instanceof FieldMetadata) {
            FieldMetadata o = (FieldMetadata) other;
            return ClassMetadata.nullOrEqual(name, o.name) &&
                   ClassMetadata.nullOrEqual(className, o.className) &&
                   ClassMetadata.nullOrEqual(declaringClassName,
                                             o.declaringClassName);
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        return ClassMetadata.hashCode(name) +
               ClassMetadata.hashCode(className) +
               ClassMetadata.hashCode(declaringClassName);
    }

    @Override
    public String toString() {
        return "[FieldMetadata name: " + name + " className: " + className +
               " declaringClassName: " + declaringClassName + ']';
    }
}