/*
* 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.expreval.expr.var;
import org.apache.expreval.client.InternalErrorException;
import org.apache.expreval.expr.MultipleExpressionContext;
import org.apache.expreval.expr.node.GenericValue;
import org.apache.expreval.expr.node.ObjectValue;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.hbql.client.HBqlException;
import org.apache.hadoop.hbase.hbql.impl.AggregateValue;
import org.apache.hadoop.hbase.hbql.impl.InvalidServerFilterException;
import org.apache.hadoop.hbase.hbql.mapping.ColumnAttrib;
import org.apache.hadoop.hbase.hbql.mapping.FieldType;
public abstract class GenericColumn<T extends GenericValue> implements GenericValue {
private final ColumnAttrib columnAttrib;
private MultipleExpressionContext expressionContext = null;
protected GenericColumn(final ColumnAttrib attrib) {
this.columnAttrib = attrib;
}
protected FieldType getFieldType() {
return this.getColumnAttrib().getFieldType();
}
public ColumnAttrib getColumnAttrib() {
return this.columnAttrib;
}
public String getVariableName() {
return this.getColumnAttrib().getFamilyQualifiedName();
}
public T getOptimizedValue() throws HBqlException {
return (T)this;
}
public boolean isAConstant() {
return false;
}
public boolean isDefaultKeyword() {
return false;
}
public boolean isAnAggregateValue() {
return false;
}
public void initAggregateValue(final AggregateValue aggregateValue) throws HBqlException {
throw new InternalErrorException("Not applicable");
}
public void applyResultToAggregateValue(final AggregateValue aggregateValue, final Result result) throws HBqlException {
throw new InternalErrorException("Not applicable");
}
public boolean hasAColumnReference() {
return true;
}
public boolean isAColumnReference() {
return true;
}
public void reset() {
if (this.getExpressionContext() != null)
this.getExpressionContext().reset();
}
public void setExpressionContext(final MultipleExpressionContext context) throws HBqlException {
this.expressionContext = context;
this.getExpressionContext().addColumnToUsedList(this);
}
protected MultipleExpressionContext getExpressionContext() {
return this.expressionContext;
}
public Class<? extends GenericValue> validateTypes(final GenericValue parentExpr,
final boolean allowCollections) throws HBqlException {
if (this.getColumnAttrib().isAnArray())
return ObjectValue.class;
else
return this.getFieldType().getExprType();
}
public String asString() {
return this.getVariableName();
}
public Filter getFilter() throws HBqlException {
throw new InvalidServerFilterException();
}
}