View Javadoc

1   /*
2    * Copyright (c) 2010.  The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.hbql.statement.args;
22  
23  import org.apache.expreval.expr.ExpressionProperty;
24  import org.apache.expreval.expr.node.GenericValue;
25  import org.apache.hadoop.hbase.hbql.client.HBqlException;
26  
27  import java.io.Serializable;
28  
29  public class ColumnWidth extends ExpressionProperty implements Serializable {
30  
31      private final boolean widthSpecified;
32      private int width = -1;
33  
34      public ColumnWidth() {
35          this(null);
36      }
37  
38      public ColumnWidth(final GenericValue val) {
39          super(SelectStatementArgs.ArgType.WIDTH, val);
40          this.widthSpecified = val != null;
41      }
42  
43      public boolean isWidthSpecified() {
44          return this.widthSpecified;
45      }
46  
47      public int getWidth() {
48          return this.width;
49      }
50  
51      public String asString() {
52          return (this.isWidthSpecified() ? "WIDTH " + this.getGenericValue(0).asString() : "");
53      }
54  
55      public void validate() throws HBqlException {
56          if (this.isWidthSpecified()) {
57              this.width = ((Number)this.evaluateConstant(0, false)).intValue();
58              if (this.getWidth() <= 0)
59                  throw new HBqlException("Invalid column width: " + this.getWidth());
60          }
61      }
62  }