| /* |
| * 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; |
| |
| import org.apache.phoenix.compile.ColumnResolver; |
| import org.apache.phoenix.schema.types.PDataType; |
| import org.apache.phoenix.util.SchemaUtil; |
| |
| /** |
| * |
| * Node representing the CAST operator in SQL. |
| * |
| * |
| * @since 0.1 |
| * |
| */ |
| public class CastParseNode extends UnaryParseNode { |
| private final PDataType dt; |
| private final Integer maxLength; |
| private final Integer scale; |
| |
| CastParseNode(ParseNode expr, String dataType, Integer maxLength, Integer scale, boolean arr) { |
| this(expr, PDataType.fromSqlTypeName(SchemaUtil.normalizeIdentifier(dataType)), maxLength, scale, arr); |
| } |
| |
| CastParseNode(ParseNode expr, PDataType dataType, Integer maxLength, Integer scale, boolean arr) { |
| super(expr); |
| if (arr == true) { |
| dt = PDataType.fromTypeId(dataType.getSqlType() + PDataType.ARRAY_TYPE_BASE); |
| } else { |
| dt = dataType; |
| } |
| this.maxLength = maxLength; |
| this.scale = scale; |
| } |
| |
| @Override |
| public <T> T accept(ParseNodeVisitor<T> visitor) throws SQLException { |
| List<T> l = Collections.emptyList(); |
| if (visitor.visitEnter(this)) { |
| l = acceptChildren(visitor); |
| } |
| return visitor.visitLeave(this, l); |
| } |
| |
| public PDataType getDataType() { |
| return dt; |
| } |
| |
| public Integer getMaxLength() { |
| return maxLength; |
| } |
| |
| public Integer getScale() { |
| return scale; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = super.hashCode(); |
| result = prime * result + ((dt == null) ? 0 : dt.hashCode()); |
| result = prime * result |
| + ((maxLength == null) ? 0 : maxLength.hashCode()); |
| result = prime * result + ((scale == null) ? 0 : scale.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (!super.equals(obj)) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| CastParseNode other = (CastParseNode) obj; |
| if (dt == null) { |
| if (other.dt != null) |
| return false; |
| } else if (!dt.equals(other.dt)) |
| return false; |
| if (maxLength == null) { |
| if (other.maxLength != null) |
| return false; |
| } else if (!maxLength.equals(other.maxLength)) |
| return false; |
| if (scale == null) { |
| if (other.scale != null) |
| return false; |
| } else if (!scale.equals(other.scale)) |
| return false; |
| return true; |
| } |
| |
| @Override |
| public void toSQL(ColumnResolver resolver, StringBuilder buf) { |
| List<ParseNode> children = getChildren(); |
| buf.append(" CAST("); |
| children.get(0).toSQL(resolver, buf); |
| buf.append(" AS "); |
| boolean isArray = dt.isArrayType(); |
| PDataType type = isArray ? PDataType.arrayBaseType(dt) : dt; |
| buf.append(type.getSqlTypeName()); |
| if (maxLength != null) { |
| buf.append('('); |
| buf.append(maxLength); |
| if (scale != null) { |
| buf.append(','); |
| buf.append(scale); // has both max length and scale. For ex- decimal(10,2) |
| } |
| buf.append(')'); |
| } |
| if (isArray) { |
| buf.append(' '); |
| buf.append(PDataType.ARRAY_TYPE_SUFFIX); |
| } |
| buf.append(")"); |
| } |
| } |