SchemaMetadataInfo.java

/**
 * Copyright 2016 Hortonworks.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/
package com.hortonworks.registries.schemaregistry;

import com.google.common.base.Preconditions;

import java.io.Serializable;

/**
 * This class encapsulates metadata about a schema which includes group, name, type, description and compatibility.
 * There can be only one instance with the same name.
 * New versions of the schema can be registered for the given {@link SchemaMetadataInfo} by giving {@link SchemaVersion} instances.
 */
public final class SchemaMetadataInfo implements Serializable {

    /**
     * metadata about the schema
     */
    private SchemaMetadata schemaMetadata;

    private Long id;

    private Long timestamp;

    @SuppressWarnings("unused")
    private SchemaMetadataInfo() { /* Private constructor for Jackson JSON mapping */}

    /**
     * @param schemaMetadata
     */
    public SchemaMetadataInfo(SchemaMetadata schemaMetadata) {
        this(schemaMetadata, null, null);
    }

    SchemaMetadataInfo(SchemaMetadata schemaMetadata,
                       Long id,
                       Long timestamp) {
        Preconditions.checkNotNull(schemaMetadata, "schemaMetadata can not be null");
        this.schemaMetadata = schemaMetadata;
        this.id = id;
        this.timestamp = timestamp;
    }

    public Long getId() {
        return id;
    }

    public Long getTimestamp() {
        return timestamp;
    }

    public SchemaMetadata getSchemaMetadata() {
        return schemaMetadata;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        SchemaMetadataInfo that = (SchemaMetadataInfo) o;

        if (schemaMetadata != null ? !schemaMetadata.equals(that.schemaMetadata) : that.schemaMetadata != null)
            return false;
        if (id != null ? !id.equals(that.id) : that.id != null) return false;
        return timestamp != null ? timestamp.equals(that.timestamp) : that.timestamp == null;

    }

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

    @Override
    public String toString() {
        return "SchemaMetadataInfo{" +
                "schemaMetadata=" + schemaMetadata +
                ", id=" + id +
                ", timestamp=" + timestamp +
                '}';
    }
}