| /* |
| * 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.filter; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.hbase.filter.FilterBase; |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.hadoop.hbase.util.Writables; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableUtils; |
| import org.apache.phoenix.expression.Expression; |
| import org.apache.phoenix.expression.ExpressionType; |
| import org.apache.phoenix.schema.IllegalDataException; |
| import org.apache.phoenix.schema.tuple.Tuple; |
| import org.apache.phoenix.util.ServerUtil; |
| |
| |
| /** |
| * |
| * Base class for filter that evaluates a WHERE clause expression. |
| * |
| * Subclass is expected to implement filterRow() method |
| * |
| * @since 0.1 |
| */ |
| abstract public class BooleanExpressionFilter extends FilterBase implements Writable { |
| |
| protected Expression expression; |
| private ImmutableBytesWritable tempPtr = new ImmutableBytesWritable(); |
| |
| public BooleanExpressionFilter() { |
| } |
| |
| public BooleanExpressionFilter(Expression expression) { |
| this.expression = expression; |
| } |
| |
| public Expression getExpression() { |
| return expression; |
| } |
| |
| @Override |
| public boolean hasFilterRow() { |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + expression.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; |
| BooleanExpressionFilter other = (BooleanExpressionFilter)obj; |
| if (!expression.equals(other.expression)) return false; |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return expression.toString(); |
| } |
| |
| @edu.umd.cs.findbugs.annotations.SuppressWarnings( |
| value="NP_BOOLEAN_RETURN_NULL", |
| justification="Returns null by design.") |
| protected Boolean evaluate(Tuple input) { |
| try { |
| if (!expression.evaluate(input, tempPtr)) { |
| return null; |
| } |
| } catch (IllegalDataException e) { |
| return Boolean.FALSE; |
| } |
| return (Boolean)expression.getDataType().toObject(tempPtr); |
| } |
| |
| @Override |
| public void readFields(DataInput input) throws IOException { |
| try { |
| expression = ExpressionType.values()[WritableUtils.readVInt(input)].newInstance(); |
| expression.readFields(input); |
| } catch (Throwable t) { // Catches incompatibilities during reading/writing and doesn't retry |
| ServerUtil.throwIOException("BooleanExpressionFilter failed during reading", t); |
| } |
| } |
| |
| @Override |
| public void write(DataOutput output) throws IOException { |
| try { |
| WritableUtils.writeVInt(output, ExpressionType.valueOf(expression).ordinal()); |
| expression.write(output); |
| } catch (Throwable t) { // Catches incompatibilities during reading/writing and doesn't retry |
| ServerUtil.throwIOException("BooleanExpressionFilter failed during writing", t); |
| } |
| } |
| |
| @Override |
| public byte[] toByteArray() throws IOException { |
| return Writables.getBytes(this); |
| } |
| |
| @Override |
| public void reset() { |
| expression.reset(); |
| } |
| } |