org.apache.fluo.core.impl.TxStringUtil.java Source code

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/*
 * 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.
 */

package org.apache.fluo.core.impl;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import com.google.common.base.Function;
import com.google.common.collect.Collections2;
import com.google.common.collect.Maps;
import org.apache.fluo.api.client.SnapshotBase;
import org.apache.fluo.api.data.Bytes;
import org.apache.fluo.api.data.Column;
import org.apache.fluo.api.data.RowColumn;

public class TxStringUtil {

    private static final Function<Bytes, String> B2S = new Function<Bytes, String>() {

        @Override
        public String apply(Bytes input) {
            return input.toString();
        }
    };

    private static final Function<String, Bytes> S2B = new Function<String, Bytes>() {

        @Override
        public Bytes apply(String input) {
            return Bytes.of(input);
        }
    };

    private static Map<String, Map<Column, String>> transform(Map<Bytes, Map<Column, Bytes>> rcvs) {
        Map<String, Map<Column, String>> ret = new HashMap<>(rcvs.size());

        for (Entry<Bytes, Map<Column, Bytes>> entry : rcvs.entrySet()) {
            ret.put(entry.getKey().toString(), Maps.transformValues(entry.getValue(), B2S));
        }
        return ret;
    }

    public static String gets(SnapshotBase snapshot, String row, Column column) {
        Bytes val = snapshot.get(Bytes.of(row), column);
        if (val == null) {
            return null;
        }
        return val.toString();
    }

    public static Map<Column, String> gets(SnapshotBase snapshot, String row, Set<Column> columns) {
        Map<Column, Bytes> values = snapshot.get(Bytes.of(row), columns);
        return Maps.transformValues(values, B2S);
    }

    public static Map<String, Map<Column, String>> gets(SnapshotBase snapshot, Collection<String> rows,
            Set<Column> columns) {
        return transform(snapshot.get(Collections2.transform(rows, S2B), columns));
    }

    public static Map<String, Map<Column, String>> gets(SnapshotBase snapshot, Collection<RowColumn> rowColumns) {
        return transform(snapshot.get(rowColumns));
    }
}