mybatis / ibatis-2 / 730

Committed 28 Dec 2025 10:16PM UTC coverage: 65.615% (+0.5%) from 65.146%

Build # 730

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github

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web-flow

Commit Message

Update README.md

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76.67

/src/main/java/com/ibatis/sqlmap/engine/mapping/result/loader/LazyResultLoader.java

/*
 * Copyright 2004-2025 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 com.ibatis.sqlmap.engine.mapping.result.loader;

import com.ibatis.common.beans.ClassInfo;
import com.ibatis.sqlmap.engine.impl.SqlMapClientImpl;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
import java.util.Set;

/**
 * Class to lazily load results into objects.
 */
public class LazyResultLoader implements InvocationHandler {

  /** The Constant SET_INTERFACES. */
  private static final Class[] SET_INTERFACES = { Set.class };

  /** The Constant LIST_INTERFACES. */
  private static final Class[] LIST_INTERFACES = { List.class };

  /** The client. */
  protected SqlMapClientImpl client;

  /** The statement name. */
  protected String statementName;

  /** The parameter object. */
  protected Object parameterObject;

  /** The target type. */
  protected Class targetType;

  /** The loaded. */
  protected boolean loaded;

  /** The result object. */
  protected Object resultObject;

  /**
   * Constructor for a lazy list loader.
   *
   * @param client
   *          - the client that is creating the lazy list
   * @param statementName
   *          - the statement to be used to build the list
   * @param parameterObject
   *          - the parameter object to be used to build the list
   * @param targetType
   *          - the type we are putting data into
   */
  public LazyResultLoader(SqlMapClientImpl client, String statementName, Object parameterObject, Class targetType) {
    this.client = client;
    this.statementName = statementName;
    this.parameterObject = parameterObject;
    this.targetType = targetType;
  }

  /**
   * Loads the result.
   *
   * @return the results - a list or object
   *
   * @throws SQLException
   *           if there is a problem
   */
  public Object loadResult() throws SQLException {
    if (Collection.class.isAssignableFrom(targetType)) {
      InvocationHandler handler = new LazyResultLoader(client, statementName, parameterObject, targetType);
      ClassLoader cl = targetType.getClassLoader();
      if (Set.class.isAssignableFrom(targetType)) {
        return Proxy.newProxyInstance(cl, SET_INTERFACES, handler);
      } else {
        return Proxy.newProxyInstance(cl, LIST_INTERFACES, handler);
      }
    } else {
      return ResultLoader.getResult(client, statementName, parameterObject, targetType);
    }
  }

  public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
    if ("finalize".hashCode() == method.getName().hashCode() && "finalize".equals(method.getName())) {
      return null;
    } else {
      loadObject();
      if (resultObject != null) {
        try {
          return method.invoke(resultObject, objects);
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
          throw ClassInfo.unwrapThrowable(e);
        }
      } else {
        return null;
      }
    }
  }

  /**
   * Load object.
   */
  private synchronized void loadObject() {
    if (!loaded) {
      try {
        loaded = true;
        resultObject = ResultLoader.getResult(client, statementName, parameterObject, targetType);
      } catch (SQLException e) {
        throw new RuntimeException("Error lazy loading result. Cause: " + e, e);
      }
    }
  }

}

1	/*
2	* Copyright 2004-2025 the original author or authors.
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* https://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16	package com.ibatis.sqlmap.engine.mapping.result.loader;
17
18	import com.ibatis.common.beans.ClassInfo;
19	import com.ibatis.sqlmap.engine.impl.SqlMapClientImpl;
20
21	import java.lang.reflect.InvocationHandler;
22	import java.lang.reflect.InvocationTargetException;
23	import java.lang.reflect.Method;
24	import java.lang.reflect.Proxy;
25	import java.sql.SQLException;
26	import java.util.Collection;
27	import java.util.List;
28	import java.util.Set;
29
30	/**
31	* Class to lazily load results into objects.
32	*/
33	public class LazyResultLoader implements InvocationHandler {
34
35	/** The Constant SET_INTERFACES. */
36	private static final Class[] SET_INTERFACES = { Set.class };	1✔
37
38	/** The Constant LIST_INTERFACES. */
39	private static final Class[] LIST_INTERFACES = { List.class };	1✔
40
41	/** The client. */
42	protected SqlMapClientImpl client;
43
44	/** The statement name. */
45	protected String statementName;
46
47	/** The parameter object. */
48	protected Object parameterObject;
49
50	/** The target type. */
51	protected Class targetType;
52
53	/** The loaded. */
54	protected boolean loaded;
55
56	/** The result object. */
57	protected Object resultObject;
58
59	/**
60	* Constructor for a lazy list loader.
61	*
62	* @param client
63	* - the client that is creating the lazy list
64	* @param statementName
65	* - the statement to be used to build the list
66	* @param parameterObject
67	* - the parameter object to be used to build the list
68	* @param targetType
69	* - the type we are putting data into
70	*/
71	public LazyResultLoader(SqlMapClientImpl client, String statementName, Object parameterObject, Class targetType) {	1✔
72	this.client = client;	1✔
73	this.statementName = statementName;	1✔
74	this.parameterObject = parameterObject;	1✔
75	this.targetType = targetType;	1✔
76	}	1✔
77
78	/**
79	* Loads the result.
80	*
81	* @return the results - a list or object
82	*
83	* @throws SQLException
84	* if there is a problem
85	*/
86	public Object loadResult() throws SQLException {
87	if (Collection.class.isAssignableFrom(targetType)) {	1✔
88	InvocationHandler handler = new LazyResultLoader(client, statementName, parameterObject, targetType);	1✔
89	ClassLoader cl = targetType.getClassLoader();	1✔
90	if (Set.class.isAssignableFrom(targetType)) {	1!
91	return Proxy.newProxyInstance(cl, SET_INTERFACES, handler);	×
92	} else {
93	return Proxy.newProxyInstance(cl, LIST_INTERFACES, handler);	1✔
94	}
95	} else {
96	return ResultLoader.getResult(client, statementName, parameterObject, targetType);	1✔
97	}
98	}
99
100	public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
101	if ("finalize".hashCode() == method.getName().hashCode() && "finalize".equals(method.getName())) {	1!
102	return null;	×
103	} else {
104	loadObject();	1✔
105	if (resultObject != null) {	1!
106	try {
107	return method.invoke(resultObject, objects);	1✔
108	} catch (IllegalAccessException \| IllegalArgumentException \| InvocationTargetException e) {	×
109	throw ClassInfo.unwrapThrowable(e);	×
110	}
111	} else {
112	return null;	×
113	}
114	}
115	}
116
117	/**
118	* Load object.
119	*/
120	private synchronized void loadObject() {
121	if (!loaded) {	1!
122	try {
123	loaded = true;	1✔
124	resultObject = ResultLoader.getResult(client, statementName, parameterObject, targetType);	1✔
125	} catch (SQLException e) {	×
126	throw new RuntimeException("Error lazy loading result. Cause: " + e, e);	×
127	}	1✔
128	}
129	}	1✔
130
131	}

mybatis / ibatis-2 / 730

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