cristof commented on code in PR #144: URL: https://github.com/apache/openjpa/pull/144#discussion_r3761796073
########## openjpa-jdbc/src/main/java/org/apache/openjpa/jdbc/kernel/exps/Left.java: ########## @@ -0,0 +1,164 @@ +/* + * 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 java.sql.SQLException; + +import org.apache.openjpa.jdbc.meta.JavaSQLTypes; +import org.apache.openjpa.jdbc.sql.Result; +import org.apache.openjpa.jdbc.sql.SQLBuffer; +import org.apache.openjpa.jdbc.sql.Select; +import org.apache.openjpa.kernel.Filters; +import org.apache.openjpa.kernel.exps.ExpressionVisitor; +import org.apache.openjpa.meta.ClassMetaData; + +/** + * Take the left part of a string. + * + * @author Abe White + * @author Paulo Cristovão Filho + * @since 4.2.0 + */ +public class Left + extends AbstractVal { + + + private static final long serialVersionUID = 1L; + private final Val _val1; + private final Val _val2; + private ClassMetaData _meta = null; + + /** + * Constructor. Provide the string and length to operate on + */ + public Left(Val val1, Val val2) { + _val1 = val1; + _val2 = val2; + } + + public Val getVal1() { + return _val1; + } + + public Val getVal2() { + return _val2; + } + + @Override + public ClassMetaData getMetaData() { + return _meta; + } + + @Override + public void setMetaData(ClassMetaData meta) { + _meta = meta; + } + + @Override + public Class getType() { + return String.class; + } + + @Override + public void setImplicitType(Class type) { + } + + @Override + public ExpState initialize(Select sel, ExpContext ctx, int flags) { + ExpState s1 = _val1.initialize(sel, ctx, 0); + ExpState s2 = _val2.initialize(sel, ctx, 0); + return new BinaryOpExpState(sel.and(s1.joins, s2.joins), s1, s2); + } + + @Override + public void select(Select sel, ExpContext ctx, ExpState state, + boolean pks) { + sel.select(newSQLBuffer(sel, ctx, state), this); + } + + @Override + public void selectColumns(Select sel, ExpContext ctx, ExpState state, + boolean pks) { + BinaryOpExpState bstate = (BinaryOpExpState) state; + _val1.selectColumns(sel, ctx, bstate.state1, true); + _val2.selectColumns(sel, ctx, bstate.state2, true); + } + + @Override + public void groupBy(Select sel, ExpContext ctx, ExpState state) { + sel.groupBy(newSQLBuffer(sel, ctx, state)); + } + + @Override + public void orderBy(Select sel, ExpContext ctx, ExpState state, + boolean asc) { + sel.orderBy(newSQLBuffer(sel, ctx, state), asc, false, getSelectAs()); + } + + private SQLBuffer newSQLBuffer(Select sel, ExpContext ctx, ExpState state) { + calculateValue(sel, ctx, state, null, null); + SQLBuffer buf = new SQLBuffer(ctx.store.getDBDictionary()); + appendTo(sel, ctx, state, buf, 0); + return buf; + } + + @Override + public Object load(ExpContext ctx, ExpState state, Result res) + throws SQLException { + return Filters.convert(res.getObject(this, + JavaSQLTypes.JDBC_DEFAULT, null), getType()); + } + + @Override + public void calculateValue(Select sel, ExpContext ctx, ExpState state, + Val other, ExpState otherState) { + BinaryOpExpState bstate = (BinaryOpExpState) state; + _val1.calculateValue(sel, ctx, bstate.state1, null, null); + _val2.calculateValue(sel, ctx, bstate.state2, null, null); + } + + @Override + public int length(Select sel, ExpContext ctx, ExpState state) { + return 1; + } + + @Override + public void appendTo(Select sel, ExpContext ctx, ExpState state, + SQLBuffer sql, int index) { + BinaryOpExpState bstate = (BinaryOpExpState) state; + FilterValue str = new FilterValueImpl(sel, ctx, bstate.state1, _val1); + FilterValue len = new FilterValueImpl(sel, ctx, bstate.state2, _val2); + + ctx.store.getDBDictionary().left(sql, str, len); + } + + @Override + public void acceptVisit(ExpressionVisitor visitor) { + visitor.enter(this); + _val1.acceptVisit(visitor); + _val2.acceptVisit(visitor); + visitor.exit(this); + } + + @Override + public int getId() { + return Val.SUBSTRING_VAL; Review Comment: Fixed found issues -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
