org.openmrs.logic.rule.definition.JavaLanguageHandler.java Source code

Introduction

Here is the source code for org.openmrs.logic.rule.definition.JavaLanguageHandler.java

Source

/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
package org.openmrs.logic.rule.definition;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Date;

import org.openmrs.api.AdministrationService;
import org.openmrs.api.context.Context;
import org.openmrs.logic.LogicConstants;
import org.openmrs.util.OpenmrsUtil;
import org.springframework.stereotype.Component;

/**
 * Plain java language handler. The user must write their own java class file and then enter the
 * rule java to the concept derived's rule section when creating a new concept.
 */
@Component
public class JavaLanguageHandler extends CompilableLanguageHandler {

    /**
      * @see org.openmrs.logic.rule.definition.LanguageHandler#getName()
      */
    public String getName() {
        return "Java";
    }

    /**
    * @see CompilableLanguageHandler#prepareSource(RuleDefinition,String)
    */
    public void prepareSource(RuleDefinition logicRule, String className) {

        AdministrationService as = Context.getAdministrationService();
        String javaDirectory = as.getGlobalProperty(LogicConstants.RULE_DEFAULT_SOURCE_FOLDER);
        File sourceDirectory = OpenmrsUtil.getDirectoryInApplicationDataDirectory(javaDirectory);

        String path = className.replace('.', File.separatorChar);

        File javaFile = new File(sourceDirectory, path + JAVA_EXTENSION);
        if (!javaFile.getParentFile().exists())
            javaFile.getParentFile().mkdirs();

        Date modifiedDate = logicRule.getDateChanged();
        if (modifiedDate == null) {
            modifiedDate = logicRule.getDateCreated();
        }

        // only compile when the java file is not exist or the concept derived is updated after the source file last modified
        if (!javaFile.exists() || modifiedDate.after(new Date(javaFile.lastModified()))) {
            String content = logicRule.getRuleContent();
            content = content.replace("{CLASSNAME}", className.substring(className.lastIndexOf('.') + 1));
            try {
                BufferedWriter writer = new BufferedWriter(new FileWriter(javaFile));
                writer.write(content);
                writer.close();
            } catch (IOException e) {
                log.error("Failed saving java rule file ...", e);
            }
        }
    }

}