| /* |
| * 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.hugegraph.backend.query; |
| |
| import org.apache.hugegraph.backend.id.Id; |
| import org.apache.hugegraph.structure.HugeElement; |
| import org.apache.hugegraph.type.HugeType; |
| import org.apache.hugegraph.util.Bytes; |
| import org.apache.hugegraph.util.E; |
| |
| public final class IdPrefixQuery extends Query { |
| |
| private final Id start; |
| private final boolean inclusiveStart; |
| private final Id prefix; |
| |
| public IdPrefixQuery(HugeType resultType, Id prefix) { |
| this(resultType, null, prefix, true, prefix); |
| } |
| |
| public IdPrefixQuery(Query originQuery, Id prefix) { |
| this(originQuery.resultType(), originQuery, prefix, true, prefix); |
| } |
| |
| public IdPrefixQuery(Query originQuery, Id start, Id prefix) { |
| this(originQuery.resultType(), originQuery, start, true, prefix); |
| } |
| |
| public IdPrefixQuery(Query originQuery, |
| Id start, boolean inclusive, Id prefix) { |
| this(originQuery.resultType(), originQuery, start, inclusive, prefix); |
| } |
| |
| public IdPrefixQuery(HugeType resultType, Query originQuery, |
| Id start, boolean inclusive, Id prefix) { |
| super(resultType, originQuery); |
| E.checkArgumentNotNull(start, "The start parameter can't be null"); |
| this.start = start; |
| this.inclusiveStart = inclusive; |
| this.prefix = prefix; |
| if (originQuery != null) { |
| this.copyBasic(originQuery); |
| } |
| } |
| |
| public Id start() { |
| return this.start; |
| } |
| |
| public boolean inclusiveStart() { |
| return this.inclusiveStart; |
| } |
| |
| public Id prefix() { |
| return this.prefix; |
| } |
| |
| @Override |
| public boolean empty() { |
| return false; |
| } |
| |
| @Override |
| public boolean test(HugeElement element) { |
| byte[] elem = element.id().asBytes(); |
| int cmp = Bytes.compare(elem, this.start.asBytes()); |
| boolean matchedStart = this.inclusiveStart ? cmp >= 0 : cmp > 0; |
| boolean matchedPrefix = Bytes.prefixWith(elem, this.prefix.asBytes()); |
| return matchedStart && matchedPrefix; |
| } |
| |
| @Override |
| public IdPrefixQuery copy() { |
| return (IdPrefixQuery) super.copy(); |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(super.toString()); |
| assert sb.length() > 0; |
| sb.deleteCharAt(sb.length() - 1); // Remove the last "`" |
| sb.append(" id prefix with ").append(this.prefix); |
| if (this.start != this.prefix) { |
| sb.append(" and start with ").append(this.start) |
| .append("(") |
| .append(this.inclusiveStart ? "inclusive" : "exclusive") |
| .append(")"); |
| } |
| sb.append("`"); |
| return sb.toString(); |
| } |
| } |