| /* |
| * 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.util.Map; |
| |
| import org.apache.openjpa.jdbc.meta.ClassMapping; |
| import org.apache.openjpa.jdbc.meta.FieldMapping; |
| import org.apache.openjpa.jdbc.schema.Column; |
| import org.apache.openjpa.jdbc.schema.Table; |
| import org.apache.openjpa.jdbc.sql.DBDictionary; |
| import org.apache.openjpa.jdbc.sql.SQLBuffer; |
| import org.apache.openjpa.jdbc.sql.Select; |
| import org.apache.openjpa.kernel.exps.ExpressionVisitor; |
| import org.apache.openjpa.meta.XMLMetaData; |
| |
| /** |
| * Test if one string ends with another. |
| * |
| * @author Abe White |
| */ |
| class EndsWithExpression |
| implements Exp { |
| |
| private final Val _val1; |
| private final Val _val2; |
| |
| /** |
| * Constructor. Supply values. |
| */ |
| public EndsWithExpression(Val val1, Val val2) { |
| _val1 = val1; |
| _val2 = val2; |
| } |
| |
| public ExpState initialize(Select sel, ExpContext ctx, Map contains) { |
| 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); |
| } |
| |
| public void appendTo(Select sel, ExpContext ctx, ExpState state, |
| SQLBuffer buf) { |
| BinaryOpExpState bstate = (BinaryOpExpState) state; |
| _val1.calculateValue(sel, ctx, bstate.state1, _val2, bstate.state2); |
| _val2.calculateValue(sel, ctx, bstate.state2, _val1, bstate.state1); |
| |
| DBDictionary dict = ctx.store.getDBDictionary(); |
| String func = dict.stringLengthFunction; |
| String pre = null; |
| String post = null; |
| if (func != null) { |
| int idx = func.indexOf("{0}"); |
| pre = func.substring(0, idx); |
| post = func.substring(idx + 3); |
| } |
| |
| if (_val1 instanceof Const && ((Const) _val1).getValue(ctx, |
| bstate.state1) == null) |
| buf.append("1 <> 1"); |
| else if (_val2 instanceof Const) { |
| Object o = ((Const) _val2).getValue(ctx, bstate.state2); |
| if (o == null) |
| buf.append("1 <> 1"); |
| else { |
| Column col = null; |
| if (_val1 instanceof PCPath) { |
| Column[] cols = ((PCPath) _val1).getColumns(bstate.state1); |
| if (cols.length == 1) |
| col = cols[0]; |
| } |
| |
| _val1.appendTo(sel, ctx, bstate.state1, buf, 0); |
| buf.append(" LIKE "); |
| buf.appendValue("%" + o.toString(), col); |
| } |
| } else { |
| // if we can't use LIKE, we have to take the substring of the |
| // first value and compare it to the second |
| dict.assertSupport(pre != null, "StringLengthFunction"); |
| dict.substring(buf, |
| new FilterValueImpl(sel, ctx, bstate.state1, _val1), |
| new StringLengthDifferenceFilterValue(sel, ctx, bstate, pre, |
| post), null); |
| buf.append(" = "); |
| _val2.appendTo(sel, ctx, bstate.state2, buf, 0); |
| } |
| |
| sel.append(buf, state.joins); |
| } |
| |
| 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); |
| } |
| |
| public void acceptVisit(ExpressionVisitor visitor) { |
| visitor.enter(this); |
| _val1.acceptVisit(visitor); |
| _val2.acceptVisit(visitor); |
| visitor.exit(this); |
| } |
| |
| /** |
| * Evaluates to the length of a given value. |
| */ |
| private class StringLengthDifferenceFilterValue |
| implements FilterValue { |
| |
| private final Select _sel; |
| private final ExpContext _ctx; |
| private final BinaryOpExpState _state; |
| private final String _pre; |
| private final String _post; |
| |
| public StringLengthDifferenceFilterValue(Select sel, ExpContext ctx, |
| BinaryOpExpState state, String pre, String post) { |
| _sel = sel; |
| _ctx = ctx; |
| _state = state; |
| _pre = pre; |
| _post = post; |
| } |
| |
| public Class getType() { |
| return int.class; |
| } |
| |
| public int length() { |
| return 1; |
| } |
| |
| public void appendTo(SQLBuffer buf) { |
| appendTo(buf, 0); |
| } |
| |
| public void appendTo(SQLBuffer buf, int index) { |
| buf.append(_pre); |
| _val1.appendTo(_sel, _ctx, _state.state1, buf, index); |
| buf.append(_post).append(" - ").append(_pre); |
| _val2.appendTo(_sel, _ctx, _state.state2, buf, index); |
| buf.append(_post); |
| } |
| |
| public String getColumnAlias(Column col) { |
| return _sel.getColumnAlias(col, _state.joins); |
| } |
| |
| public String getColumnAlias(String col, Table table) { |
| return _sel.getColumnAlias(col, table, _state.joins); |
| } |
| |
| public Object toDataStoreValue(Object val) { |
| return val; |
| } |
| |
| public boolean isConstant() { |
| return false; |
| } |
| |
| public Object getValue() { |
| return null; |
| } |
| |
| public Object getSQLValue() { |
| return null; |
| } |
| |
| public boolean isPath() { |
| return false; |
| } |
| |
| public ClassMapping getClassMapping() { |
| return null; |
| } |
| |
| public FieldMapping getFieldMapping() { |
| return null; |
| } |
| |
| public PCPath getXPath() { |
| return null; |
| } |
| |
| public XMLMetaData getXmlMapping() { |
| return null; |
| } |
| } |
| } |