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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.axis2.wsdl.util;

import org.apache.axis2.wsdl.i18n.CodegenMessages;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/** Loads the properties from the config properties. */
public class ConfigPropertyFileLoader {


    private static Map dbSupporterTemplateNameMap;
    private static String testObjectTemplateName;
    private static String srcFolderName;
    private static String resourceFolderName;
    private static String[] extensionClassNames;
    private static String[] postExtensionClassNames;
    private static String[] thirdPartySchemaNames;
    private static String[] languageTypes;
    private static String[] databindingFrameworkNames;
    private static String[] unwrapSuppoerteddatabindingFrameworkNames;
    private static String[] unwrapDirectdatabindingFrameworkNames;

    private static Map languageEmitterMap;
    private static Map languageSpecificPropertiesMap;
    private static Map databindingFrameworkNameToExtensionMap;

    private static String defaultLanguage;
    private static String defaultDBFrameworkName;


    private static final String CODE_GEN_KEY_PREFIX = "codegen.extension";
    private static final String POST_CODE_GEN_KEY_PREFIX = "post.codegen.extension";
    private static final String THIRD_PARTY_SCHEMA_KEY_PREFIX = "codegen.thirdparty.schema";
    private static final String LANGUAGE_TYPE_KEY_PREFIX = "codegen.languages";
    private static final String DEFAULT_LANGUAGE_TYPE_KEY = "codegen.languages.default";
    private static final String EMITTER_CLASS_KEY = "codegen.emitters";
    private static final String DATA_BINDING_FRAMEWORK_NAME_KEY = "codegen.databinding.frameworks";
    private static final String DATA_BINDING_UNWRAP_SUPPORTED_FRAMEWORK_NAME_KEY =
            "codegen.databinding.unwrap.supported";
    private static final String DATA_BINDING_UNWRAP_DIRECT_FRAMEWORK_NAME_KEY =
            "codegen.databinding.unwrap.direct";
    private static final String DATA_BINDING_FRAMEWORK_DEFAULT_NAME_KEY =
            "codegen.databinding.frameworks.default";
    private static final String DATA_BINDING_FRAMEWORK_EXTENSION_NAME_KEY =
            "codegen.databinding.extensions";
    private static final String DATA_BINDING_TEMPLATE_NAME_KEY_PREFIX = "codegen.databinding.";
    private static final String DATA_BINDING_TEMPLATE_NAME_KEY_SUFFIX = "template";
    private static final String DATA_BINDING_TEST_OBJECT_TEMPLATE_NAME_KEY =
            "codegen.databinding.testobject.template";
    private static final String SOURCE_FOLDER_NAME_KEY = "codegen.general.src.name";
    private static final String RESOURCE_FOLDER_NAME_KEY = "codegen.general.resource.name";


    public static final String DEFAULT_CODEGEN_CONFIG_PROPERTIES =
            "/org/apache/axis2/wsdl/codegen/codegen-config.properties";

    /* Note - Should be a non regular expression character. If not it should be properly escaped */
    private static final String SEPARATOR_CHAR = ",";

    /**
     * Loads a stream from the given
     *
     * @param propertiesReference
     * @throws FileNotFoundException
     */
    private static InputStream getStream(String propertiesReference) throws FileNotFoundException {
        InputStream stream =
                ConfigPropertyFileLoader.class.getResourceAsStream(propertiesReference);
        if (stream == null) {
            URL url = ConfigPropertyFileLoader.class.getResource(propertiesReference);
            stream = new FileInputStream(url.toString());
        }
        return stream;
    }

    static {
        loadAllProperties();
    }

    public static void reload() {
        reset();
        loadAllProperties();
    }

    private static void reset() {
        dbSupporterTemplateNameMap = new HashMap();
        testObjectTemplateName = null;
        extensionClassNames = null;
        thirdPartySchemaNames = null;
        languageTypes = null;
        databindingFrameworkNames = null;
        languageEmitterMap = null;
        languageSpecificPropertiesMap = null;
        databindingFrameworkNameToExtensionMap = null;
        defaultLanguage = null;
        defaultDBFrameworkName = null;
        srcFolderName = null;
        resourceFolderName = null;

    }

    private static void loadAllProperties() {
        try {
            //look for the system property "org.apache.axis2.codegen.config" to for a property
            //entry refering to the config properties
            String property = System.getProperty("org.apache.axis2.codegen.config");
            InputStream stream;

            if (property != null) {
                stream = getStream(property);
            } else {
                stream = getStream(DEFAULT_CODEGEN_CONFIG_PROPERTIES);
            }

            if (stream == null) {
                throw new RuntimeException(
                        CodegenMessages.getMessage("propfileload.generalException"));
            }

            Properties props = new Properties();
            props.load(stream);

            //create a new map for the lang specific properties
            languageSpecificPropertiesMap = new HashMap();

            //create a new map for the databinding frameworks and their extensions
            databindingFrameworkNameToExtensionMap = new HashMap();

            //load the extension class names
            String tempString = props.getProperty(CODE_GEN_KEY_PREFIX);
            if (tempString != null) {
                extensionClassNames = tempString.split(SEPARATOR_CHAR);

            }

            //load the post extension class names
            tempString = props.getProperty(POST_CODE_GEN_KEY_PREFIX);
            if (tempString != null) {
                postExtensionClassNames = tempString.split(SEPARATOR_CHAR);

            }
            //load the data binding framework names
            tempString = props.getProperty(DATA_BINDING_FRAMEWORK_NAME_KEY);
            if (tempString != null) {
                databindingFrameworkNames = tempString.split(SEPARATOR_CHAR);
            }

            //load the unwrap supported data binding framework names
            tempString = props.getProperty(DATA_BINDING_UNWRAP_SUPPORTED_FRAMEWORK_NAME_KEY);
            if (tempString != null) {
                unwrapSuppoerteddatabindingFrameworkNames = tempString.split(SEPARATOR_CHAR);
            }

            //load the unwrap supported data binding framework names
            tempString = props.getProperty(DATA_BINDING_UNWRAP_DIRECT_FRAMEWORK_NAME_KEY);
            if (tempString != null) {
                unwrapDirectdatabindingFrameworkNames = tempString.split(SEPARATOR_CHAR);
            }

            //load the source folder
            tempString = props.getProperty(SOURCE_FOLDER_NAME_KEY);
            if (tempString != null) {
                srcFolderName = tempString;
            }

            //load the resource folder name
            tempString = props.getProperty(RESOURCE_FOLDER_NAME_KEY);
            if (tempString != null) {
                resourceFolderName = tempString;
            }

            //populate the data binding framework name to extension name map
            tempString = props.getProperty(DATA_BINDING_FRAMEWORK_EXTENSION_NAME_KEY);
            if (tempString != null) {
                String[] frameworkExtensionNames = tempString.split(SEPARATOR_CHAR);

                try {
                    for (int i = 0; i < frameworkExtensionNames.length; i++) {
                        databindingFrameworkNameToExtensionMap
                                .put(databindingFrameworkNames[i], frameworkExtensionNames[i]);
                    }
                } catch (ArrayIndexOutOfBoundsException e) {
                    throw new Exception(
                            CodegenMessages.getMessage("propfileload.frameworkMismatch"));
                }

            }

            //load the default framework name
            tempString = props.getProperty(DATA_BINDING_FRAMEWORK_DEFAULT_NAME_KEY);

            if (tempString == null ||
                    !databindingFrameworkNameToExtensionMap.containsKey(tempString)) {
                throw new Exception(CodegenMessages.getMessage("propfileload.unknownFramework"));
            }
            defaultDBFrameworkName = tempString;
            //load the third party schema names
            tempString = props.getProperty(THIRD_PARTY_SCHEMA_KEY_PREFIX);
            if (tempString != null) {
                thirdPartySchemaNames = tempString.split(SEPARATOR_CHAR);

            }

            //populate the db supporter template names.
            dbSupporterTemplateNameMap = new HashMap();
            String key;
            for (Iterator allProperties = props.keySet().iterator();
                 allProperties.hasNext();) {
                key = (String)allProperties.next();
                if (key.startsWith(DATA_BINDING_TEMPLATE_NAME_KEY_PREFIX) &&
                        key.endsWith(DATA_BINDING_TEMPLATE_NAME_KEY_SUFFIX)) {
                    dbSupporterTemplateNameMap.put(key,
                                                   props.getProperty(key));
                }

            }

            testObjectTemplateName = props.getProperty(DATA_BINDING_TEST_OBJECT_TEMPLATE_NAME_KEY);

            //load the language names
            tempString = props.getProperty(LANGUAGE_TYPE_KEY_PREFIX);
            if (tempString != null) {
                languageTypes = tempString.split(SEPARATOR_CHAR);

                //load the language emitter map
                tempString = props.getProperty(EMITTER_CLASS_KEY);
                if (tempString == null) {
                    throw new Exception(CodegenMessages.getMessage("propfileload.emitterMissing"));
                } else {
                    String[] tempClassNames = tempString.split(SEPARATOR_CHAR);
                    //populate the map
                    languageEmitterMap = new HashMap();
                    for (int i = 0; i < tempClassNames.length; i++) {
                        languageEmitterMap.put(languageTypes[i], tempClassNames[i]);
                    }

                }
            }

            // load the default language
            tempString = props.getProperty(DEFAULT_LANGUAGE_TYPE_KEY);
            if (null == tempString || !languageEmitterMap.containsKey(tempString)) {
                throw new Exception(CodegenMessages.getMessage("propfileload.unknownDefaultLang"));
            }
            defaultLanguage = tempString;

            // run through the language specific properties and populate the
            // language specific property map
            //
            String languageType;
            String tempkey;
            HashMap langSpecificMap;
            for (int i = 0; i < languageTypes.length; i++) {
                languageType = languageTypes[i];
                langSpecificMap = new HashMap();
                Enumeration keyEnum = props.keys();
                while (keyEnum.hasMoreElements()) {
                    tempkey = keyEnum.nextElement().toString();
                    if (tempkey.startsWith(languageType + ".")) {
                        langSpecificMap.put(tempkey, props.get(tempkey));
                    }
                }
                //now add this to the lang specific properties map
                languageSpecificPropertiesMap.put(languageType, langSpecificMap);
            }


        } catch (IOException e) {
            throw new RuntimeException(e);
        } catch (Exception e) {
            throw new RuntimeException(CodegenMessages.getMessage("propfileload.generalException"),
                                       e);
        }
    }

    /** @return the source folder name */
    public static String getResourceFolderName() {
        return resourceFolderName;
    }


    /** @return the resource folder name */
    public static String getSrcFolderName() {
        return srcFolderName;
    }

    /**
     * Gets the test object support template. This is used in the generated test class.
     *
     * @return Returns String.
     */
    public static String getTestObjectTemplateName() {
        return testObjectTemplateName;
    }

    /**
     * Gets the databinder template names. This is the template that has the logic for creating the
     * databind supporters.
     *
     * @return Returns String.
     */
    public static Map getDbSupporterTemplatesMap() {
        return dbSupporterTemplateNameMap;
    }

    /**
     * Gets the extension class names.
     *
     * @return Returns String[].
     */
    public static String[] getExtensionClassNames() {
        return extensionClassNames;
    }

    /**
     * get the post extension class names
     *
     * @return Returns String[].
     */
    public static String[] getPostExtensionClassNames() {
        return postExtensionClassNames;
    }

    /**
     * Gets the third party schema names list.
     *
     * @return Returns String[].
     */
    public static String[] getThirdPartySchemaNames() {
        return thirdPartySchemaNames;
    }

    /**
     * Gets the language type names.
     *
     * @return Returns String[].
     */
    public static String[] getLanguageTypes() {
        return languageTypes;
    }

    /**
     * Gets the emitter names map keys with the language name.
     *
     * @return Returns Map.
     */
    public static Map getLanguageEmitterMap() {
        return languageEmitterMap;
    }

    /**
     * Get the list of unwrap supported data binding frameworks
     *
     * @return list
     */
    public static List getUnwrapSupportedFrameworkNames() {
        return Arrays.asList(unwrapSuppoerteddatabindingFrameworkNames);
    }

    /**
     * Get the list of data binding frameworks that handle unwrapping directly.
     *
     * @return names
     */
    public static List getUnwrapDirectFrameworkNames() {
        return Arrays.asList(unwrapDirectdatabindingFrameworkNames);
    }

    /**
     * Gets the default language name.
     *
     * @return Returns String.
     */
    public static String getDefaultLanguage() {
        return defaultLanguage;
    }

    /**
     * Gets the language specific properties.
     *
     * @return Returns Map.
     */
    public static Map getLanguageSpecificPropertiesMap() {
        return languageSpecificPropertiesMap;
    }

    /**
     * Gets the databinding framework names.
     *
     * @return Returns String[].
     */
    public static String[] getDatabindingFrameworkNames() {
        return databindingFrameworkNames;
    }

    /**
     * Gets the extensions map for the databinding frameworks. The entries are keys by the framework
     * name.
     *
     * @return Returns Map.
     */
    public static Map getDatabindingFrameworkNameToExtensionMap() {
        return databindingFrameworkNameToExtensionMap;
    }

    /**
     * Gets the default DB framwork name.
     *
     * @return Returns String.
     */
    public static String getDefaultDBFrameworkName() {
        return defaultDBFrameworkName;
    }
}




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