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wenshao
2013-04-11 19:41:31 +08:00
parent 76a963ac46
commit 31ea197998
13 changed files with 579 additions and 0 deletions
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src/main/java/com/alibaba/druid/sql/visitor/functions/Greatest.java
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/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* Licensed 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 com.alibaba.druid.sql.visitor.functions;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.sql.visitor.SQLEvalVisitor;
import com.alibaba.druid.sql.visitor.SQLEvalVisitorUtils;
public class Greatest implements Function {
public final static Greatest instance = new Greatest();
public Object eval(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
Object result = null;
for (SQLExpr item : x.getParameters()) {
item.accept(visitor);
Object itemValue = item.getAttributes().get(EVAL_VALUE);
if (result == null) {
result = itemValue;
} else {
if (SQLEvalVisitorUtils.gt(itemValue, result)) {
result = itemValue;
}
}
}
return result;
}
}
src/main/java/com/alibaba/druid/sql/visitor/functions/If.java
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/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* Licensed 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 com.alibaba.druid.sql.visitor.functions;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_ERROR;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
import java.util.List;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.sql.visitor.SQLEvalVisitor;
import com.alibaba.druid.sql.visitor.SQLEvalVisitorUtils;
public class If implements Function {
public final static If instance = new If();
public Object eval(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
final List<SQLExpr> parameters = x.getParameters();
if (parameters.size() == 0) {
return EVAL_ERROR;
}
SQLExpr condition = parameters.get(0);
condition.accept(visitor);
Object itemValue = condition.getAttributes().get(EVAL_VALUE);
if (Boolean.TRUE == itemValue || !SQLEvalVisitorUtils.eq(itemValue, 0)) {
SQLExpr trueExpr = parameters.get(1);
trueExpr.accept(visitor);
return trueExpr.getAttributes().get(EVAL_VALUE);
} else {
SQLExpr falseExpr = parameters.get(2);
falseExpr.accept(visitor);
return falseExpr.getAttributes().get(EVAL_VALUE);
}
}
}
src/main/java/com/alibaba/druid/sql/visitor/functions/Isnull.java
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/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* Licensed 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 com.alibaba.druid.sql.visitor.functions;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_ERROR;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE_NULL;
import java.util.List;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.sql.visitor.SQLEvalVisitor;
public class Isnull implements Function {
public final static Isnull instance = new Isnull();
public Object eval(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
final List<SQLExpr> parameters = x.getParameters();
if (parameters.size() == 0) {
return EVAL_ERROR;
}
SQLExpr condition = parameters.get(0);
condition.accept(visitor);
Object itemValue = condition.getAttributes().get(EVAL_VALUE);
if (itemValue == null || itemValue == EVAL_VALUE_NULL) {
return Boolean.TRUE;
} else {
return Boolean.FALSE;
}
}
}
src/main/java/com/alibaba/druid/sql/visitor/functions/Least.java
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/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* Licensed 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 com.alibaba.druid.sql.visitor.functions;
import static com.alibaba.druid.sql.visitor.SQLEvalVisitor.EVAL_VALUE;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
import com.alibaba.druid.sql.visitor.SQLEvalVisitor;
import com.alibaba.druid.sql.visitor.SQLEvalVisitorUtils;
public class Least implements Function {
public final static Least instance = new Least();
public Object eval(SQLEvalVisitor visitor, SQLMethodInvokeExpr x) {
Object result = null;
for (SQLExpr item : x.getParameters()) {
item.accept(visitor);
Object itemValue = item.getAttributes().get(EVAL_VALUE);
if (result == null) {
result = itemValue;
} else {
if (SQLEvalVisitorUtils.lt(itemValue, result)) {
result = itemValue;
}
}
}
return result;
}
}