package org.apache.ibatis.builder.xml.dynamic;
import java.util.HashMap;
import java.util.Map;
import ognl.OgnlContext;
import ognl.OgnlException;
import ognl.OgnlRuntime;
import ognl.PropertyAccessor;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
public class DynamicContext {
public static final String PARAMETER_OBJECT_KEY = "_parameter";
static {
OgnlRuntime.setPropertyAccessor(ContextMap.class, new ContextAccessor());
}
private final ContextMap bindings;
private final StringBuilder sqlBuilder = new StringBuilder();
private int uniqueNumber = 0;
public DynamicContext(Configuration configuration, Object parameterObject) {
if (parameterObject != null && !(parameterObject instanceof Map)) {
MetaObject metaObject = configuration.newMetaObject(parameterObject);
bindings = new ContextMap(metaObject);
} else {
bindings = new ContextMap(null);
}
bindings.put(PARAMETER_OBJECT_KEY, parameterObject);
}
public Map<String, Object> getBindings() {
return bindings;
}
public void bind(String name, Object value) {
bindings.put(name, value);
}
public void appendSql(String sql) {
sqlBuilder.append(sql);
sqlBuilder.append(" ");
}
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 MetaObject parameterMetaObject;
public ContextMap(MetaObject parameterMetaObject) {
this.parameterMetaObject = parameterMetaObject;
}
@Override
public Object get(Object key) {
if (super.containsKey(key)) {
return super.get(key);
}
if (parameterMetaObject != null) {
Object object = parameterMetaObject.getValue(key.toString());
if (object != null) {
super.put(key.toString(), object);
}
return object;
}
return null;
}
}
static class ContextAccessor implements PropertyAccessor {
public Object getProperty(Map context, Object target, Object name)
throws OgnlException {
Map map = (Map) target;
Object result = map.get(name);
if (result != null) {
return result;
}
Object parameterObject = map.get(PARAMETER_OBJECT_KEY);
if (parameterObject instanceof Map) {
return ((Map)parameterObject).get(name);
}
return null;
}
public void setProperty(Map context, Object target, Object name, Object value)
throws OgnlException {
Map map = (Map) target;
map.put(name, value);
}
}
}