| /** |
| * 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.bookkeeper.metastore; |
| |
| import com.google.common.primitives.UnsignedBytes; |
| import com.google.common.hash.Hasher; |
| import com.google.common.hash.HashFunction; |
| import com.google.common.hash.Hashing; |
| |
| import java.util.Comparator; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.Collections; |
| |
| import static com.google.common.base.Charsets.UTF_8; |
| |
| import static org.apache.bookkeeper.metastore.MetastoreTable.ALL_FIELDS; |
| |
| public class Value { |
| static final Comparator<byte[]> comparator = |
| UnsignedBytes.lexicographicalComparator(); |
| |
| protected Map<String, byte[]> fields; |
| |
| public Value() { |
| fields = new HashMap<String, byte[]>(); |
| } |
| |
| public Value(Value v) { |
| fields = new HashMap<String, byte[]>(v.fields); |
| } |
| |
| public byte[] getField(String field) { |
| return fields.get(field); |
| } |
| |
| public Value setField(String field, byte[] data) { |
| fields.put(field, data); |
| return this; |
| } |
| |
| public Value clearFields() { |
| fields.clear(); |
| return this; |
| } |
| |
| public Set<String> getFields() { |
| return fields.keySet(); |
| } |
| |
| public Map<String, byte[]> getFieldsMap() { |
| return Collections.unmodifiableMap(fields); |
| } |
| |
| /** |
| * Select parts of fields. |
| * |
| * @param fields |
| * Parts of fields |
| * @return new value with specified fields |
| */ |
| public Value project(Set<String> fields) { |
| if (ALL_FIELDS == fields) { |
| return new Value(this); |
| } |
| Value v = new Value(); |
| for (String f : fields) { |
| byte[] data = this.fields.get(f); |
| v.setField(f, data); |
| } |
| return v; |
| } |
| |
| @Override |
| public int hashCode() { |
| HashFunction hf = Hashing.murmur3_32(); |
| Hasher hc = hf.newHasher(); |
| for (String key : fields.keySet()) { |
| hc.putString(key); |
| } |
| return hc.hash().asInt(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (!(o instanceof Value)) { |
| return false; |
| } |
| Value other = (Value) o; |
| if (fields.size() != other.fields.size()) { |
| return false; |
| } |
| for (String f : fields.keySet()) { |
| byte[] v1 = fields.get(f); |
| byte[] v2 = other.fields.get(f); |
| if (0 != comparator.compare(v1, v2)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Merge other value. |
| * |
| * @param other |
| * Other Value |
| */ |
| public Value merge(Value other) { |
| for (Map.Entry<String, byte[]> entry : other.fields.entrySet()) { |
| if (null == entry.getValue()) { |
| fields.remove(entry.getKey()); |
| } else { |
| fields.put(entry.getKey(), entry.getValue()); |
| } |
| } |
| return this; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("["); |
| for (Map.Entry<String, byte[]> entry : fields.entrySet()) { |
| String f = entry.getKey(); |
| if (null == f) { |
| f = "NULL"; |
| } |
| String value; |
| if (null == entry.getValue()) { |
| value = "NONE"; |
| } else { |
| value = new String(entry.getValue(), UTF_8); |
| } |
| sb.append("('").append(f).append("'=").append(value).append(")"); |
| } |
| sb.append("]"); |
| return sb.toString(); |
| } |
| } |