/*
* 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.literal;
import org.apache.expreval.client.InternalErrorException;
import org.apache.expreval.expr.MultipleExpressionContext;
import org.apache.expreval.expr.node.GenericValue;
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.HConnectionImpl;
import org.apache.hadoop.hbase.hbql.impl.InvalidServerFilterException;
import java.io.Serializable;
public abstract class GenericLiteral<T extends Serializable> implements GenericValue {
private final T value;
public GenericLiteral(final T value) {
this.value = value;
}
public T getValue(final HConnectionImpl conn, final Object object) {
return this.value;
}
public GenericValue getOptimizedValue() throws HBqlException {
return this;
}
public boolean isAConstant() {
return true;
}
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 false;
}
public boolean isAColumnReference() {
return false;
}
public void reset() {
}
public void setExpressionContext(final MultipleExpressionContext context) {
}
public Class<? extends GenericValue> validateTypes(final GenericValue parentExpr,
final boolean allowCollections) throws HBqlException {
return this.getReturnType();
}
protected abstract Class<? extends GenericValue> getReturnType();
public String asString() {
return "" + this.getValue(null, null);
}
public Filter getFilter() throws HBqlException {
throw new InvalidServerFilterException();
}
}