XMLScriptBuilder.java
/*
* Copyright 2009-2023 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
*
* https://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.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.builder.BaseBuilder;
import org.apache.ibatis.builder.BuilderException;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.parsing.XNode;
import org.apache.ibatis.scripting.defaults.RawSqlSource;
import org.apache.ibatis.session.Configuration;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* @author Clinton Begin
*/
public class XMLScriptBuilder extends BaseBuilder {
private final XNode context;
private boolean isDynamic;
private final Class<?> parameterType;
private final Map<String, NodeHandler> nodeHandlerMap = new HashMap<>();
public XMLScriptBuilder(Configuration configuration, XNode context) {
this(configuration, context, null);
}
public XMLScriptBuilder(Configuration configuration, XNode context, Class<?> parameterType) {
super(configuration);
this.context = context;
this.parameterType = parameterType;
initNodeHandlerMap();
}
private void initNodeHandlerMap() {
nodeHandlerMap.put("trim", new TrimHandler());
nodeHandlerMap.put("where", new WhereHandler());
nodeHandlerMap.put("set", new SetHandler());
nodeHandlerMap.put("foreach", new ForEachHandler());
nodeHandlerMap.put("if", new IfHandler());
nodeHandlerMap.put("choose", new ChooseHandler());
nodeHandlerMap.put("when", new IfHandler());
nodeHandlerMap.put("otherwise", new OtherwiseHandler());
nodeHandlerMap.put("bind", new BindHandler());
}
public SqlSource parseScriptNode() {
MixedSqlNode rootSqlNode = parseDynamicTags(context);
SqlSource sqlSource;
if (isDynamic) {
sqlSource = new DynamicSqlSource(configuration, rootSqlNode);
} else {
sqlSource = new RawSqlSource(configuration, rootSqlNode, parameterType);
}
return sqlSource;
}
protected MixedSqlNode parseDynamicTags(XNode node) {
List<SqlNode> contents = new ArrayList<>();
NodeList children = node.getNode().getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
XNode child = node.newXNode(children.item(i));
if (child.getNode().getNodeType() == Node.CDATA_SECTION_NODE || child.getNode().getNodeType() == Node.TEXT_NODE) {
String data = child.getStringBody("");
TextSqlNode textSqlNode = new TextSqlNode(data);
if (textSqlNode.isDynamic()) {
contents.add(textSqlNode);
isDynamic = true;
} else {
contents.add(new StaticTextSqlNode(data));
}
} else if (child.getNode().getNodeType() == Node.ELEMENT_NODE) { // issue #628
String nodeName = child.getNode().getNodeName();
NodeHandler handler = nodeHandlerMap.get(nodeName);
if (handler == null) {
throw new BuilderException("Unknown element <" + nodeName + "> in SQL statement.");
}
handler.handleNode(child, contents);
isDynamic = true;
}
}
return new MixedSqlNode(contents);
}
private interface NodeHandler {
void handleNode(XNode nodeToHandle, List<SqlNode> targetContents);
}
private static class BindHandler implements NodeHandler {
public BindHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
final String name = nodeToHandle.getStringAttribute("name");
final String expression = nodeToHandle.getStringAttribute("value");
final VarDeclSqlNode node = new VarDeclSqlNode(name, expression);
targetContents.add(node);
}
}
private class TrimHandler implements NodeHandler {
public TrimHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
MixedSqlNode mixedSqlNode = parseDynamicTags(nodeToHandle);
String prefix = nodeToHandle.getStringAttribute("prefix");
String prefixOverrides = nodeToHandle.getStringAttribute("prefixOverrides");
String suffix = nodeToHandle.getStringAttribute("suffix");
String suffixOverrides = nodeToHandle.getStringAttribute("suffixOverrides");
TrimSqlNode trim = new TrimSqlNode(configuration, mixedSqlNode, prefix, prefixOverrides, suffix, suffixOverrides);
targetContents.add(trim);
}
}
private class WhereHandler implements NodeHandler {
public WhereHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
MixedSqlNode mixedSqlNode = parseDynamicTags(nodeToHandle);
WhereSqlNode where = new WhereSqlNode(configuration, mixedSqlNode);
targetContents.add(where);
}
}
private class SetHandler implements NodeHandler {
public SetHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
MixedSqlNode mixedSqlNode = parseDynamicTags(nodeToHandle);
SetSqlNode set = new SetSqlNode(configuration, mixedSqlNode);
targetContents.add(set);
}
}
private class ForEachHandler implements NodeHandler {
public ForEachHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
MixedSqlNode mixedSqlNode = parseDynamicTags(nodeToHandle);
String collection = nodeToHandle.getStringAttribute("collection");
Boolean nullable = nodeToHandle.getBooleanAttribute("nullable");
String item = nodeToHandle.getStringAttribute("item");
String index = nodeToHandle.getStringAttribute("index");
String open = nodeToHandle.getStringAttribute("open");
String close = nodeToHandle.getStringAttribute("close");
String separator = nodeToHandle.getStringAttribute("separator");
ForEachSqlNode forEachSqlNode = new ForEachSqlNode(configuration, mixedSqlNode, collection, nullable, index, item,
open, close, separator);
targetContents.add(forEachSqlNode);
}
}
private class IfHandler implements NodeHandler {
public IfHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
MixedSqlNode mixedSqlNode = parseDynamicTags(nodeToHandle);
String test = nodeToHandle.getStringAttribute("test");
IfSqlNode ifSqlNode = new IfSqlNode(mixedSqlNode, test);
targetContents.add(ifSqlNode);
}
}
private class OtherwiseHandler implements NodeHandler {
public OtherwiseHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
MixedSqlNode mixedSqlNode = parseDynamicTags(nodeToHandle);
targetContents.add(mixedSqlNode);
}
}
private class ChooseHandler implements NodeHandler {
public ChooseHandler() {
// Prevent Synthetic Access
}
@Override
public void handleNode(XNode nodeToHandle, List<SqlNode> targetContents) {
List<SqlNode> whenSqlNodes = new ArrayList<>();
List<SqlNode> otherwiseSqlNodes = new ArrayList<>();
handleWhenOtherwiseNodes(nodeToHandle, whenSqlNodes, otherwiseSqlNodes);
SqlNode defaultSqlNode = getDefaultSqlNode(otherwiseSqlNodes);
ChooseSqlNode chooseSqlNode = new ChooseSqlNode(whenSqlNodes, defaultSqlNode);
targetContents.add(chooseSqlNode);
}
private void handleWhenOtherwiseNodes(XNode chooseSqlNode, List<SqlNode> ifSqlNodes,
List<SqlNode> defaultSqlNodes) {
List<XNode> children = chooseSqlNode.getChildren();
for (XNode child : children) {
String nodeName = child.getNode().getNodeName();
NodeHandler handler = nodeHandlerMap.get(nodeName);
if (handler instanceof IfHandler) {
handler.handleNode(child, ifSqlNodes);
} else if (handler instanceof OtherwiseHandler) {
handler.handleNode(child, defaultSqlNodes);
}
}
}
private SqlNode getDefaultSqlNode(List<SqlNode> defaultSqlNodes) {
SqlNode defaultSqlNode = null;
if (defaultSqlNodes.size() == 1) {
defaultSqlNode = defaultSqlNodes.get(0);
} else if (defaultSqlNodes.size() > 1) {
throw new BuilderException("Too many default (otherwise) elements in choose statement.");
}
return defaultSqlNode;
}
}
}