| /* |
| * 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.math.BigDecimal; |
| import java.sql.SQLException; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.phoenix.compile.ColumnResolver; |
| import org.apache.phoenix.schema.types.PDataType; |
| import org.apache.phoenix.schema.types.PTimestamp; |
| |
| /** |
| * |
| * Node representing literal expressions such as 1,2.5,'foo', and NULL in SQL |
| * |
| * |
| * @since 0.1 |
| */ |
| public class LiteralParseNode extends TerminalParseNode { |
| public static final List<ParseNode> STAR = Collections.<ParseNode>singletonList(new LiteralParseNode(1)); |
| public static final ParseNode NULL = new LiteralParseNode(null); |
| public static final ParseNode ZERO = new LiteralParseNode(0); |
| public static final ParseNode ONE = new LiteralParseNode(1); |
| public static final ParseNode MINUS_ONE = new LiteralParseNode(-1L); |
| public static final ParseNode TRUE = new LiteralParseNode(true); |
| // Parser representation of Long.MIN_VALUE, as ABS(Long.MIN_VALUE) is too big to fit into a Long |
| public static final ParseNode MIN_LONG_AS_BIG_DECIMAL = new LiteralParseNode(BigDecimal.valueOf(Long.MIN_VALUE).abs()); |
| // See ParseNodeFactory.negate(), as MIN_LONG_AS_BIG_DECIMAL will be converted MIN_LONG if negated. |
| public static final ParseNode MIN_LONG = new LiteralParseNode(Long.MIN_VALUE); |
| |
| private final Object value; |
| private final PDataType type; |
| |
| public LiteralParseNode(Object value) { |
| this.type = PDataType.fromLiteral(value); |
| // This will make the value null if the value passed through represents null for the given type. |
| // For example, an empty string is treated as a null. |
| this.value = this.type == null ? null : this.type.toObject(value, this.type); |
| } |
| |
| public LiteralParseNode(Object value, PDataType type) { |
| this.type = type; |
| // This will make the value null if the value passed through represents null for the given type. |
| // For example, an empty string is treated as a null. |
| this.value = this.type == null ? null : this.type.toObject(value, this.type); |
| } |
| |
| public PDataType getType() { |
| return type; |
| } |
| |
| public Object getValue() { |
| return value; |
| } |
| |
| @Override |
| public boolean isStateless() { |
| return true; |
| } |
| |
| @Override |
| public <T> T accept(ParseNodeVisitor<T> visitor) throws SQLException { |
| return visitor.visit(this); |
| } |
| |
| public byte[] getBytes() { |
| return type == null ? null : type.toBytes(value); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((type == null) ? 0 : type.hashCode()); |
| result = prime * result + ((value == null) ? 0 : value.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| LiteralParseNode other = (LiteralParseNode) obj; |
| if (value == other.value) return true; |
| if (type == null) return false; |
| return type.isComparableTo(other.type) && type.compareTo(value, other.value, other.type) == 0; |
| } |
| |
| @Override |
| public void toSQL(ColumnResolver resolver, StringBuilder buf) { |
| if (value == null) { |
| buf.append(" null "); |
| } else { |
| // TODO: move into PDataType? |
| if (type.isCoercibleTo(PTimestamp.INSTANCE)) { |
| buf.append(type); |
| buf.append(' '); |
| buf.append(type.toStringLiteral(value, null)); |
| } else { |
| buf.append(type.toStringLiteral(value, null)); |
| } |
| } |
| } |
| } |