| /* |
| * 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.phoenix.parse; |
| |
| import org.apache.phoenix.compile.ColumnResolver; |
| |
| |
| /** |
| * |
| * Node representing an ORDER BY clause (including asc/desc and nulls first/last) in SQL |
| * |
| * |
| * @since 0.1 |
| */ |
| public final class OrderByNode { |
| private final ParseNode child; |
| private final boolean nullsLast; |
| private final boolean orderAscending; |
| |
| OrderByNode(ParseNode child, boolean nullsLast, boolean orderAscending) { |
| this.child = child; |
| this.nullsLast = nullsLast; |
| this.orderAscending = orderAscending; |
| } |
| |
| public boolean isNullsLast() { |
| return nullsLast; |
| } |
| |
| public boolean isAscending() { |
| return orderAscending; |
| } |
| |
| public ParseNode getNode() { |
| return child; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((child == null) ? 0 : child.hashCode()); |
| result = prime * result + (nullsLast ? 1231 : 1237); |
| result = prime * result + (orderAscending ? 1231 : 1237); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) return true; |
| if (obj == null) return false; |
| if (getClass() != obj.getClass()) return false; |
| OrderByNode other = (OrderByNode)obj; |
| if (child == null) { |
| if (other.child != null) return false; |
| } else if (!child.equals(other.child)) return false; |
| if (nullsLast != other.nullsLast) return false; |
| if (orderAscending != other.orderAscending) return false; |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return child.toString() + (orderAscending ? " asc" : " desc") + " nulls " + (nullsLast ? "last" : "first"); |
| } |
| |
| public void toSQL(ColumnResolver resolver, StringBuilder buf) { |
| child.toSQL(resolver, buf); |
| if (!orderAscending) buf.append(" DESC"); |
| if (nullsLast) buf.append(" NULLS LAST "); |
| } |
| } |