Java tutorial
/* * 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.hadoop.hive.accumulo; import java.io.DataInput; import java.io.DataOutput; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; import org.apache.commons.lang.builder.HashCodeBuilder; import org.apache.hadoop.io.Text; import org.apache.hadoop.io.Writable; import com.google.common.base.Preconditions; /** * Holds column tuples for rowID. Each tuple contains column family label, qualifier label, and byte * array value. */ public class AccumuloHiveRow implements Writable { private String rowId; private List<ColumnTuple> tuples = new ArrayList<ColumnTuple>(); public AccumuloHiveRow() { } public AccumuloHiveRow(String rowId) { this.rowId = rowId; } public void setRowId(String rowId) { this.rowId = rowId; } public List<ColumnTuple> getTuples() { return Collections.unmodifiableList(tuples); } /** * @return true if this instance has a tuple containing fam and qual, false otherwise. */ public boolean hasFamAndQual(Text fam, Text qual) { for (ColumnTuple tuple : tuples) { if (tuple.getCf().equals(fam) && tuple.getCq().equals(qual)) { return true; } } return false; } /** * @return byte [] value for first tuple containing fam and qual or null if no match. */ public byte[] getValue(Text fam, Text qual) { for (ColumnTuple tuple : tuples) { if (tuple.getCf().equals(fam) && tuple.getCq().equals(qual)) { return tuple.getValue(); } } return null; } public String getRowId() { return rowId; } public void clear() { this.rowId = null; this.tuples = new ArrayList<ColumnTuple>(); } @Override public String toString() { StringBuilder builder = new StringBuilder("AccumuloHiveRow{"); builder.append("rowId='").append(rowId).append("', tuples: "); for (ColumnTuple tuple : tuples) { builder.append(tuple.toString()); builder.append("\n"); } return builder.toString(); } @Override public boolean equals(Object o) { if (o instanceof AccumuloHiveRow) { AccumuloHiveRow other = (AccumuloHiveRow) o; if (null == rowId) { if (null != other.rowId) { return false; } } else if (!rowId.equals(other.rowId)) { return false; } return tuples.equals(other.tuples); } return false; } @Override public void write(DataOutput dataOutput) throws IOException { if (null != rowId) { dataOutput.writeBoolean(true); dataOutput.writeUTF(rowId); } else { dataOutput.writeBoolean(false); } int size = tuples.size(); dataOutput.writeInt(size); for (ColumnTuple tuple : tuples) { Text cf = tuple.getCf(), cq = tuple.getCq(); dataOutput.writeInt(cf.getLength()); dataOutput.write(cf.getBytes(), 0, cf.getLength()); dataOutput.writeInt(cq.getLength()); dataOutput.write(cq.getBytes(), 0, cq.getLength()); byte[] value = tuple.getValue(); dataOutput.writeInt(value.length); dataOutput.write(value); } } @Override public void readFields(DataInput dataInput) throws IOException { if (dataInput.readBoolean()) { rowId = dataInput.readUTF(); } int size = dataInput.readInt(); for (int i = 0; i < size; i++) { int cfLength = dataInput.readInt(); byte[] cfData = new byte[cfLength]; dataInput.readFully(cfData, 0, cfLength); Text cf = new Text(cfData); int cqLength = dataInput.readInt(); byte[] cqData = new byte[cqLength]; dataInput.readFully(cqData, 0, cqLength); Text cq = new Text(cqData); int valSize = dataInput.readInt(); byte[] val = new byte[valSize]; for (int j = 0; j < valSize; j++) { val[j] = dataInput.readByte(); } tuples.add(new ColumnTuple(cf, cq, val)); } } public void add(String cf, String qual, byte[] val) { Preconditions.checkNotNull(cf); Preconditions.checkNotNull(qual); Preconditions.checkNotNull(val); add(new Text(cf), new Text(qual), val); } public void add(Text cf, Text qual, byte[] val) { Preconditions.checkNotNull(cf); Preconditions.checkNotNull(qual); Preconditions.checkNotNull(val); tuples.add(new ColumnTuple(cf, qual, val)); } public static class ColumnTuple { private final Text cf; private final Text cq; private final byte[] value; public ColumnTuple(Text cf, Text cq, byte[] value) { this.value = value; this.cf = cf; this.cq = cq; } public byte[] getValue() { return value; } public Text getCf() { return cf; } public Text getCq() { return cq; } @Override public int hashCode() { HashCodeBuilder hcb = new HashCodeBuilder(9683, 68783); return hcb.append(cf).append(cq).append(value).toHashCode(); } @Override public boolean equals(Object o) { if (o instanceof ColumnTuple) { ColumnTuple other = (ColumnTuple) o; if (null == cf) { if (null != other.cf) { return false; } } else if (!cf.equals(other.cf)) { return false; } if (null == cq) { if (null != other.cq) { return false; } } else if (!cq.equals(other.cq)) { return false; } if (null == value) { if (null != other.value) { return false; } } return Arrays.equals(value, other.value); } return false; } @Override public String toString() { return cf + " " + cq + " " + new String(value); } } }