Java tutorial
/* * Copyright 2014, Stratio. * * 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 com.stratio.cassandra.index.schema; import com.stratio.cassandra.index.util.ByteBufferUtils; import org.apache.cassandra.db.marshal.AbstractType; import org.apache.cassandra.db.marshal.AsciiType; import org.apache.cassandra.db.marshal.BytesType; import org.apache.cassandra.db.marshal.UTF8Type; import org.apache.cassandra.utils.Hex; import org.apache.commons.lang3.builder.ToStringBuilder; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.document.Field; import org.apache.lucene.document.StringField; import org.apache.lucene.search.SortField; import org.apache.lucene.search.SortField.Type; import org.codehaus.jackson.annotate.JsonCreator; import java.nio.ByteBuffer; /** * A {@link ColumnMapper} to map blob values. * * @author Andres de la Pena <adelapena@stratio.com> */ public class ColumnMapperBlob extends ColumnMapper<String> { /** * Builds a new {@link ColumnMapperBlob}. */ @JsonCreator public ColumnMapperBlob() { super(new AbstractType<?>[] { AsciiType.instance, UTF8Type.instance, BytesType.instance }, new AbstractType[] {}); } /** {@inheritDoc} */ @Override public Analyzer analyzer() { return EMPTY_ANALYZER; } /** {@inheritDoc} */ @Override public String indexValue(String name, Object value) { if (value == null) { return null; } else if (value instanceof ByteBuffer) { ByteBuffer bb = (ByteBuffer) value; return ByteBufferUtils.toHex(bb); } else if (value instanceof byte[]) { byte[] bytes = (byte[]) value; return ByteBufferUtils.toHex(bytes); } else if (value instanceof String) { String string = (String) value; string = string.replaceFirst("0x", ""); byte[] bytes = Hex.hexToBytes(string); return Hex.bytesToHex(bytes); } else { throw new IllegalArgumentException(String.format("Value '%s' cannot be cast to byte array", value)); } } /** {@inheritDoc} */ @Override public String queryValue(String name, Object value) { if (value == null) { return null; } else { return value.toString().toLowerCase().replaceFirst("0x", ""); } } /** {@inheritDoc} */ @Override public Field field(String name, Object value) { String string = indexValue(name, value); return new StringField(name, string, STORE); } /** {@inheritDoc} */ @Override public SortField sortField(String field, boolean reverse) { return new SortField(field, Type.STRING, reverse); } /** {@inheritDoc} */ @Override public Class<String> baseClass() { return String.class; } /** {@inheritDoc} */ @Override public String toString() { return new ToStringBuilder(this).toString(); } }