/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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*/
package org.teiid.translator.accumulo;
import java.util.Arrays;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.accumulo.core.client.Connector;
import org.apache.accumulo.core.client.Scanner;
import org.apache.accumulo.core.client.TableNotFoundException;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Value;
import org.apache.hadoop.io.Text;
import org.teiid.metadata.*;
import org.teiid.metadata.Column.SearchType;
import org.teiid.translator.MetadataProcessor;
import org.teiid.translator.TranslatorProperty;
import org.teiid.translator.TranslatorProperty.PropertyType;
import org.teiid.translator.TypeFacility;
public class AccumuloMetadataProcessor implements MetadataProcessor<AccumuloConnection> {
@ExtensionMetadataProperty(applicable=Column.class, datatype=String.class, display="Column Family", description="Column Familiy from the Key", required=true)
public static final String CF = MetadataFactory.ACCUMULO_URI+"CF"; //$NON-NLS-1$
@ExtensionMetadataProperty(applicable=Column.class, datatype=String.class, display="Column Qualifier", description="If Column Qualifier from key makes the key value unique, then this is required")
public static final String CQ = MetadataFactory.ACCUMULO_URI+"CQ"; //$NON-NLS-1$
@ExtensionMetadataProperty(applicable=Column.class, datatype=String.class, display="Value In", description="The value of key exists in Column Qualifier or Value slot; Default is VALUE, if value is in CQ then this property is required", allowed= "CQ,VALUE")
public static final String VALUE_IN = MetadataFactory.ACCUMULO_URI+"VALUE-IN"; //$NON-NLS-1$
// allowed patterns {CF}, {CQ}, {VALUE}, {ROWID}
public static final String DEFAULT_COLUMN_NAME_PATTERN = "{CF}_{CQ}"; //$NON-NLS-1$
public static final String DEFAULT_VALUE_PATTERN = "{VALUE}"; //$NON-NLS-1$
public static final String ROWID = "rowid"; //$NON-NLS-1$
public enum ValueIn{CQ,VALUE};
private String columnNamePattern = DEFAULT_COLUMN_NAME_PATTERN;
private String valueIn = DEFAULT_VALUE_PATTERN;
public void process(MetadataFactory mf, AccumuloConnection conn) {
Connector connector = conn.getInstance();
Set<String> tableNames = connector.tableOperations().list();
for (String tableName:tableNames) {
try {
if (tableName.equals("!METADATA") || tableName.equals("trace")) { //$NON-NLS-1$ //$NON-NLS-2$
continue;
}
Text previousRow = null;
Table table = null;
Scanner scanner = connector.createScanner(tableName, conn.getAuthorizations());
for (Entry<Key, Value> entry : scanner) {
Key key = entry.getKey();
Text cf = key.getColumnFamily();
Text cq = key.getColumnQualifier();
Text row = key.getRow();
if (previousRow == null || previousRow.equals(row)) {
previousRow = row;
if (mf.getSchema().getTable(tableName) == null) {
table = mf.addTable(tableName);
Column column = mf.addColumn(AccumuloMetadataProcessor.ROWID, TypeFacility.RUNTIME_NAMES.STRING, table);
column.setSearchType(SearchType.All_Except_Like);
mf.addPrimaryKey("PK0", Arrays.asList(AccumuloMetadataProcessor.ROWID), table); //$NON-NLS-1$
column.setUpdatable(false);
}
else {
table = mf.getSchema().getTable(tableName);
}
Column column = mf.addColumn(buildColumnName(cf, cq, row), TypeFacility.RUNTIME_NAMES.STRING, table);
column.setSearchType(SearchType.All_Except_Like);
column.setProperty(CF, cf.toString());
column.setProperty(CQ, cq.toString());
column.setProperty(VALUE_IN, getValueIn());
column.setUpdatable(true);
}
else {
break;
}
}
scanner.close();
if (table != null) {
table.setSupportsUpdate(true);
}
} catch (TableNotFoundException e) {
continue;
}
}
}
private String buildColumnName(Text cf, Text cq, Text rowid) {
String pattern = getColumnNamePattern();
pattern = pattern.replace("{CF}", cf.toString()); //$NON-NLS-1$
pattern = pattern.replace("{CQ}", cq.toString()); //$NON-NLS-1$
pattern = pattern.replace("{ROWID}", rowid.toString()); //$NON-NLS-1$
return pattern;
}
@TranslatorProperty(display="Column Name Pattern", category=PropertyType.IMPORT, description="Pattern to derive column names from, available expressions to use({CF}, {CQ}, {ROW_ID}")
public String getColumnNamePattern() {
return columnNamePattern;
}
public void setColumnNamePattern(String columnNamePattern) {
this.columnNamePattern = columnNamePattern;
}
@TranslatorProperty(display="Value In", category=PropertyType.IMPORT, description="Defines where the data value of property is in {VALUE} or {CQ}")
public String getValueIn() {
return valueIn;
}
public void setValueIn(String valueIn) {
this.valueIn = valueIn;
}
}