org.apache.openjpa.jdbc.kernel.exps.Index Maven / Gradle / Ivy
/*
* 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.openjpa.jdbc.kernel.exps;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.util.InternalException;
/**
* Index.
*
* @author Catalina Wei
*/
class Index
extends UnaryOp {
public Index(Val val) {
super(val);
}
public ExpState initialize(Select sel, ExpContext ctx, int flags) {
// initialize the value with a null test
return initializeValue(sel, ctx, NULL_CMP);
}
public void appendTo(Select sel, ExpContext ctx, ExpState state,
SQLBuffer sql, int index) {
getValue().calculateValue(sel, ctx, state, null, null);
getValue().appendIndex(sel, ctx, state, sql);
sel.append(sql, state.joins);
}
protected Class getType(Class c) {
return long.class;
}
protected String getOperator() {
// since we override appendTo(), this method should never be called
throw new InternalException();
}
}