| /* |
| * 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 java.sql.SQLException; |
| import java.util.Collections; |
| import java.util.List; |
| |
| |
| |
| /** |
| * |
| * Abstract node representing an expression node that has children |
| * |
| * |
| * @since 0.1 |
| */ |
| public abstract class CompoundParseNode extends ParseNode { |
| |
| private final List<ParseNode> children; |
| private final boolean isStateless; |
| |
| CompoundParseNode(List<ParseNode> children) { |
| this.children = Collections.unmodifiableList(children); |
| boolean isStateless = true; |
| for (ParseNode child : children) { |
| isStateless &= child.isStateless(); |
| if (!isStateless) { |
| break; |
| } |
| } |
| this.isStateless = isStateless; |
| } |
| |
| @Override |
| public boolean isStateless() { |
| return isStateless; |
| } |
| |
| @Override |
| public final List<ParseNode> getChildren() { |
| return children; |
| } |
| |
| |
| final <T> List<T> acceptChildren(ParseNodeVisitor<T> visitor) throws SQLException { |
| List<T> l = visitor.newElementList(children.size()); |
| for (int i = 0; i < children.size(); i++) { |
| T e = children.get(i).accept(visitor); |
| visitor.addElement(l, e); |
| } |
| return l; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result |
| + ((children == null) ? 0 : children.hashCode()); |
| result = prime * result + (isStateless ? 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; |
| CompoundParseNode other = (CompoundParseNode) obj; |
| if (children == null) { |
| if (other.children != null) |
| return false; |
| } else if (!children.equals(other.children)) |
| return false; |
| if (isStateless != other.isStateless) |
| return false; |
| return true; |
| } |
| } |