jp.terasoluna.fw.beans.jxpath.JXPATH152PatchActivator.java Source code

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Here is the source code for jp.terasoluna.fw.beans.jxpath.JXPATH152PatchActivator.java

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/*
 * Copyright (c) 2012 NTT DATA Corporation
 *
 * 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 jp.terasoluna.fw.beans.jxpath;

import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Map;

import org.apache.commons.jxpath.JXPathIntrospector;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * commons-JXPath??(JXPATH-152)??
 * <p>
 * ??? JXPathIntrospector??????private static(byClass, byInterface)?HashMap ?(
 * {@link HashMapForJXPathIntrospector})???<br>
 * </p>
 * <p>
 * ???????????(??????????)???<br>
 * applicationContext.xml??????????? <fieldset> <legend>applicationContext.xml</legend> &lt;bean
 * id=&quot;jxpathPatchActivator&quot; class=&quot;jp.terasoluna.fw.beans.jxpath.JXPATH152PatchActivator&quot;/&gt; </fieldset>
 * </p>
 * <p>
 * <br>
 * ????JXPathIntrospector?private static????? ????????
 * private??(java.lang.reflect.ReflectPermission?suppressAccessChecks)????<br>
 * ???private???(??????????????????)??? ???????????
 * ???jar??????private????? <fieldset> <legend>??(Tomcat?)</legend>
 * 
 * <pre>
 * grant codeBase "file:${catalina.home}/webapps/ContextRoot/WEB-INF/lib/???jar??" {
 *     permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
 * };
 * </pre>
 * 
 * </fieldset> (???????codeBase "file:"????)<br>
 * ????????????????? commons-JXPath-1.3??JXPathIntrospector?????commons-JXPath?????
 * ????????????FATAL?<br>
 * ????Error???????????????????<br>
 * ??????Error??????????????????????????
 * </p>
 * @see HashMapForJXPathIntrospector
 */
public class JXPATH152PatchActivator {

    /**
     * 
     */
    private static final Log log = LogFactory.getLog(JXPATH152PatchActivator.class);

    static {
        // ??
        // (??????????????????)
        AccessController.doPrivileged(new PrivilegedAction<Void>() {
            @Override
            public Void run() {
                activate();
                return null;
            }
        });
    }

    /**
     * ??
     */
    private static void activate() {
        try {
            // ?????Map?
            Field byClassField = JXPathIntrospector.class.getDeclaredField("byClass");
            byClassField.setAccessible(true);
            Map<?, ?> byClass = (Map<?, ?>) byClassField.get(null);

            Field byInterfaceField = JXPathIntrospector.class.getDeclaredField("byInterface");
            byInterfaceField.setAccessible(true);
            Map<?, ?> byInterface = (Map<?, ?>) byInterfaceField.get(null);

            // Map??
            byClassField.set(null, new HashMapForJXPathIntrospector<Object, Object>(byClass));
            byInterfaceField.set(null, new HashMapForJXPathIntrospector<Object, Object>(byInterface));

            log.info("JXPATH-152 Patch activation succeeded.");
        } catch (Exception e) {
            // ?????
            // ???????commons-JXPath?????
            log.fatal("JXPATH-152 Patch activation failed.", e);
        }
    }
}