com.bigdata.dastor.db.filter.QueryPath.java Source code

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Here is the source code for com.bigdata.dastor.db.filter.QueryPath.java

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package com.bigdata.dastor.db.filter;
/*
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * 
 */

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.DataInputStream;

import org.apache.commons.lang.ArrayUtils;

import com.bigdata.dastor.db.ColumnSerializer;
import com.bigdata.dastor.thrift.ColumnParent;
import com.bigdata.dastor.thrift.ColumnPath;

public class QueryPath {
    public final String columnFamilyName;
    public final byte[] superColumnName;
    public final byte[] columnName;

    public QueryPath(String columnFamilyName, byte[] superColumnName, byte[] columnName) {
        this.columnFamilyName = columnFamilyName;
        this.superColumnName = superColumnName;
        this.columnName = columnName;
    }

    public QueryPath(ColumnParent columnParent) {
        this(columnParent.column_family, columnParent.super_column, null);
    }

    public QueryPath(String columnFamilyName, byte[] superColumnName) {
        this(columnFamilyName, superColumnName, null);
    }

    public QueryPath(String columnFamilyName) {
        this(columnFamilyName, null);
    }

    public QueryPath(ColumnPath column_path) {
        this(column_path.column_family, column_path.super_column, column_path.column);
    }

    public static QueryPath column(byte[] columnName) {
        return new QueryPath(null, null, columnName);
    }

    @Override
    public String toString() {
        return "QueryPath(" + "columnFamilyName='" + columnFamilyName + '\'' + ", superColumnName='"
                + superColumnName + '\'' + ", columnName='" + columnName + '\'' + ')';
    }

    public void serialize(DataOutputStream dos) throws IOException {
        assert !"".equals(columnFamilyName);
        assert superColumnName == null || superColumnName.length > 0;
        assert columnName == null || columnName.length > 0;
        dos.writeUTF(columnFamilyName == null ? "" : columnFamilyName);
        ColumnSerializer.writeName(superColumnName == null ? ArrayUtils.EMPTY_BYTE_ARRAY : superColumnName, dos);
        ColumnSerializer.writeName(columnName == null ? ArrayUtils.EMPTY_BYTE_ARRAY : columnName, dos);
    }

    public static QueryPath deserialize(DataInputStream din) throws IOException {
        String cfName = din.readUTF();
        byte[] scName = ColumnSerializer.readName(din);
        byte[] cName = ColumnSerializer.readName(din);
        return new QueryPath(cfName.isEmpty() ? null : cfName, scName.length == 0 ? null : scName,
                cName.length == 0 ? null : cName);
    }
}