| /* |
| * 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; |
| |
| /** |
| * Compares two values. |
| * |
| * @author Abe White |
| */ |
| class NotEqualExpression |
| extends CompareEqualExpression { |
| |
| /** |
| * Constructor. Supply values to compare. |
| */ |
| public NotEqualExpression(Val val1, Val val2) { |
| super(val1, val2); |
| } |
| |
| public void appendTo(Select sel, ExpContext ctx, BinaryOpExpState bstate, |
| SQLBuffer buf, boolean val1Null, boolean val2Null) { |
| if (val1Null && val2Null) |
| buf.append("1 <> 1"); |
| else if (val1Null || val2Null) { |
| Val val = (val1Null) ? getValue2() : getValue1(); |
| ExpState state = (val1Null) ? bstate.state2 : bstate.state1; |
| if (!isDirectComparison()) { |
| int len = val.length(sel, ctx, state); |
| for (int i = 0; i < len; i++) { |
| if (i > 0) |
| buf.append(" AND "); |
| val.appendTo(sel, ctx, state, buf, i); |
| buf.append(" IS NOT ").appendValue(null); |
| } |
| } else |
| val.appendIsNotNull(sel, ctx, state, buf); |
| } else { |
| Val val1 = getValue1(); |
| Val val2 = getValue2(); |
| if (val1.length(sel, ctx, bstate.state1) == 1 |
| && val2.length(sel, ctx, bstate.state2) == 1) { |
| ctx.store.getDBDictionary().comparison(buf, "<>", |
| new FilterValueImpl(sel, ctx, bstate.state1, val1), |
| new FilterValueImpl(sel, ctx, bstate.state2, val2)); |
| } else { |
| int len = java.lang.Math.max(val1.length(sel, ctx, |
| bstate.state1), val2.length(sel, ctx, bstate.state2)); |
| buf.append("("); |
| for (int i = 0; i < len; i++) { |
| if (i > 0) |
| buf.append(" OR "); |
| val1.appendTo(sel, ctx, bstate.state1, buf, i); |
| buf.append(" <> "); |
| val2.appendTo(sel, ctx, bstate.state2, buf, i); |
| } |
| buf.append(")"); |
| } |
| } |
| } |
| } |