SchemaIdImpl.java

/*
 * Copyright 2012 NGDATA nv
 *
 * 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 org.lilyproject.repository.impl.id;

import java.util.Arrays;
import java.util.UUID;

import org.lilyproject.bytes.api.DataInput;
import org.lilyproject.bytes.api.DataOutput;
import org.lilyproject.bytes.impl.DataInputImpl;
import org.lilyproject.bytes.impl.DataOutputImpl;
import org.lilyproject.repository.api.SchemaId;

public class SchemaIdImpl implements SchemaId {

    private UUID uuid;
    private byte[] bytes;
    private String string;

    public SchemaIdImpl(UUID uuid) {
        this.uuid = uuid;
        this.bytes = idToBytes(uuid);
    }

    public SchemaIdImpl(byte[] id) {
        this.bytes = id;
    }

    public SchemaIdImpl(String id) {
        this.string = id;
        this.uuid = UUID.fromString(id);
        this.bytes = idToBytes(uuid);
    }

    @Override
    public byte[] getBytes() {
        return bytes;
    }

    public String toString() {
        if (string == null) {
            if (uuid == null) {
                DataInput dataInput = new DataInputImpl(bytes);
                this.uuid = new UUID(dataInput.readLong(), dataInput.readLong());
            }
            this.string = uuid.toString();
        }
        return string;
    }

    private byte[] idToBytes(UUID uuid) {
        DataOutput dataOutput = new DataOutputImpl(16);
        dataOutput.writeLong(uuid.getMostSignificantBits());
        dataOutput.writeLong(uuid.getLeastSignificantBits());
        return dataOutput.toByteArray();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + Arrays.hashCode(bytes);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        SchemaIdImpl other = (SchemaIdImpl) obj;
        if (!Arrays.equals(bytes, other.bytes)) {
            return false;
        }
        return true;
    }


}