/*
* Copyright (c) 2011. The Apache Software Foundation
*
* 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.yaoql.client;
import com.google.common.base.Predicate;
import org.apache.expreval.client.NullColumnValueException;
import org.apache.expreval.client.ResultMissingColumnException;
import org.apache.expreval.expr.ExpressionTree;
import org.apache.hadoop.hbase.hbql.client.HBqlException;
import org.apache.hadoop.hbase.hbql.mapping.MappingContext;
import org.apache.hadoop.hbase.hbql.parser.ParserUtil;
import org.apache.yaoql.impl.ParameterBinding;
import org.apache.yaoql.impl.ReflectionMapping;
import java.util.concurrent.atomic.AtomicBoolean;
public class ObjectQueryPredicate<T> extends ParameterBinding implements Predicate<T> {
private final String query;
private ExpressionTree expressionTree = null;
private AtomicBoolean initialized = new AtomicBoolean(false);
public ObjectQueryPredicate(final String query) {
this.query = query;
}
public void reset() {
this.initialized.set(false);
}
public String getQuery() {
return this.query;
}
private ExpressionTree getExpressionTree() {
return this.expressionTree;
}
private boolean isInitialized() {
return this.initialized.get();
}
public boolean apply(final T obj) {
try {
if (!this.isInitialized()) {
final ReflectionMapping mapping = ReflectionMapping.getReflectionMapping(obj);
final MappingContext mappingContext = new MappingContext(mapping);
this.expressionTree = ParserUtil.parseWhereExpression(this.query, mappingContext);
this.applyParameters(this.getExpressionTree());
this.initialized.set(true);
}
return this.getExpressionTree().evaluate(null, obj);
}
catch (ResultMissingColumnException e) {
// Not possible
return false;
}
catch (NullColumnValueException e) {
// Not possible
return false;
}
catch (HBqlException e) {
e.printStackTrace();
return false;
}
}
}