forked from mybatis/mybatis-3
/
DynamicContext.java
142 lines (116 loc) · 4.14 KB
/
DynamicContext.java
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/**
* Copyright 2009-2019 the original author or authors.
*
* 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 org.apache.ibatis.scripting.xmltags;
import java.util.HashMap;
import java.util.Map;
import java.util.StringJoiner;
import ognl.OgnlContext;
import ognl.OgnlRuntime;
import ognl.PropertyAccessor;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
/**
* @author Clinton Begin
*/
public class DynamicContext {
public static final String PARAMETER_OBJECT_KEY = "_parameter";
public static final String DATABASE_ID_KEY = "_databaseId";
static {
OgnlRuntime.setPropertyAccessor(ContextMap.class, new ContextAccessor());
}
private final ContextMap bindings;
private final StringJoiner sqlBuilder = new StringJoiner(" ");
private int uniqueNumber = 0;
public DynamicContext(Configuration configuration, Object parameterObject) {
if (parameterObject != null && !(parameterObject instanceof Map)) {
MetaObject metaObject = configuration.newMetaObject(parameterObject);
boolean existsTypeHandler = configuration.getTypeHandlerRegistry().hasTypeHandler(parameterObject.getClass());
bindings = new ContextMap(metaObject, existsTypeHandler);
} else {
bindings = new ContextMap(null, false);
}
bindings.put(PARAMETER_OBJECT_KEY, parameterObject);
bindings.put(DATABASE_ID_KEY, configuration.getDatabaseId());
}
public Map<String, Object> getBindings() {
return bindings;
}
public void bind(String name, Object value) {
bindings.put(name, value);
}
public void appendSql(String sql) {
sqlBuilder.add(sql);
}
public String getSql() {
return sqlBuilder.toString().trim();
}
public int getUniqueNumber() {
return uniqueNumber++;
}
static class ContextMap extends HashMap<String, Object> {
private static final long serialVersionUID = 2977601501966151582L;
private final MetaObject parameterMetaObject;
private final boolean fallbackParameterObject;
public ContextMap(MetaObject parameterMetaObject, boolean fallbackParameterObject) {
this.parameterMetaObject = parameterMetaObject;
this.fallbackParameterObject = fallbackParameterObject;
}
@Override
public Object get(Object key) {
String strKey = (String) key;
if (super.containsKey(strKey)) {
return super.get(strKey);
}
if (parameterMetaObject == null) {
return null;
}
if (fallbackParameterObject && !parameterMetaObject.hasGetter(strKey)) {
return parameterMetaObject.getOriginalObject();
} else {
// issue #61 do not modify the context when reading
return parameterMetaObject.getValue(strKey);
}
}
}
static class ContextAccessor implements PropertyAccessor {
@Override
public Object getProperty(Map context, Object target, Object name) {
Map map = (Map) target;
Object result = map.get(name);
if (map.containsKey(name) || result != null) {
return result;
}
Object parameterObject = map.get(PARAMETER_OBJECT_KEY);
if (parameterObject instanceof Map) {
return ((Map)parameterObject).get(name);
}
return null;
}
@Override
public void setProperty(Map context, Object target, Object name, Object value) {
Map<Object, Object> map = (Map<Object, Object>) target;
map.put(name, value);
}
@Override
public String getSourceAccessor(OgnlContext arg0, Object arg1, Object arg2) {
return null;
}
@Override
public String getSourceSetter(OgnlContext arg0, Object arg1, Object arg2) {
return null;
}
}
}