/*
* 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;
import org.apache.expreval.client.NullColumnValueException;
import org.apache.expreval.client.ResultMissingColumnException;
import org.apache.expreval.expr.literal.BooleanLiteral;
import org.apache.expreval.expr.node.BooleanValue;
import org.apache.expreval.expr.node.GenericValue;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.hbql.client.HBqlException;
import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
import org.apache.hadoop.hbase.hbql.mapping.Mapping;
import org.apache.hadoop.hbase.hbql.mapping.MappingContext;
public class ExpressionTree extends MultipleExpressionContext {
private static FunctionTypeSignature exprSig = new FunctionTypeSignature(BooleanValue.class, BooleanValue.class);
private boolean useResultData = false;
private boolean allowColumns = true;
private Mapping embeddedMapping = null;
public ExpressionTree() {
}
private ExpressionTree(final GenericValue rootValue) {
super(exprSig, rootValue);
}
public static ExpressionTree newExpressionTree(final Mapping mapping, final GenericValue booleanValue) {
final ExpressionTree tree = new ExpressionTree(booleanValue == null ? new BooleanLiteral(true) : booleanValue);
// This is stashed until validate() is called. This avoids throwing HBqlException in parser
tree.embeddedMapping = mapping;
return tree;
}
// This is not done in newExpressionTree() because that is called from the parser
public void setEmbeddedMapping() throws HBqlException {
if (this.embeddedMapping != null)
this.setMappingContext(new MappingContext(this.embeddedMapping));
}
public Boolean evaluate(final HConnectionImpl conn, final Object object) throws HBqlException,
ResultMissingColumnException,
NullColumnValueException {
return (Boolean)this.evaluate(conn, 0, this.allowColumns(), false, object);
}
private GenericValue getGenericValue() {
return this.getGenericValue(0);
}
public Filter getFilter() throws HBqlException {
this.validateTypes(true, true);
this.optimize();
return this.getGenericValue().getFilter();
}
public String asString() {
return this.getGenericValue().asString();
}
public void setUseResultData(final boolean useResultData) {
this.useResultData = useResultData;
}
public boolean useResultData() {
return this.useResultData;
}
public boolean allowColumns() {
return this.allowColumns;
}
public void setAllowColumns(final boolean allowColumns) {
this.allowColumns = allowColumns;
}
}