/*
* 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.hadoop.hbase.hbql.statement;
import org.apache.expreval.expr.node.GenericValue;
import org.apache.hadoop.hbase.hbql.client.ExecutionResults;
import org.apache.hadoop.hbase.hbql.client.HBqlException;
import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
import org.apache.hadoop.hbase.hbql.statement.select.SimpleExpressionContext;
public class EvalStatement extends GenericStatement implements ConnectionStatement {
private final GenericValue genericValue;
public EvalStatement(final GenericValue genericValue) {
super(null);
this.genericValue = genericValue;
}
private GenericValue getGenericValue() {
return this.genericValue;
}
public ExecutionResults execute(HConnectionImpl connection) throws HBqlException {
final ExecutionResults retval = new ExecutionResults("Parsed successfully");
if (this.getGenericValue() != null) {
final SimpleExpressionContext expr = new SimpleExpressionContext(this.getGenericValue());
expr.validate();
final Object val = expr.getValue(connection);
retval.out.println(this.getGenericValue().asString() + " = " + val);
}
return retval;
}
public static String usage() {
return "EVAL expression";
}
}