de.jcup.egradle.codeassist.dsl.FilesystemFileLoader.java Source code

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Here is the source code for de.jcup.egradle.codeassist.dsl.FilesystemFileLoader.java

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/*
 * Copyright 2016 Albert Tregnaghi
 *
 * 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 de.jcup.egradle.codeassist.dsl;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;

public class FilesystemFileLoader implements DSLFileLoader {
    private File dslFolder;
    private XMLTypeImporter typeImporter;
    private XMLPluginsImporter pluginsImporter;
    private ApiMappingImporter apiMappingImporter;
    private static final Pattern PATTERN_EVERY_DOT = Pattern.compile("\\.");

    public FilesystemFileLoader(XMLTypeImporter typeImporter, XMLPluginsImporter pluginsImporter,
            ApiMappingImporter apiMappingImporter) {
        if (typeImporter == null) {
            throw new IllegalArgumentException("typeImporter must not be null!");
        }
        if (pluginsImporter == null) {
            throw new IllegalArgumentException("pluginsImporter must not be null!");
        }
        if (apiMappingImporter == null) {
            throw new IllegalArgumentException("apiMappingImporter must not be null!");
        }
        this.typeImporter = typeImporter;
        this.pluginsImporter = pluginsImporter;
        this.apiMappingImporter = apiMappingImporter;
    }

    public void setDSLFolder(File folder) {
        this.dslFolder = folder;
    }

    @Override
    public Type loadType(String name) throws IOException {
        if (dslFolder == null) {
            throw new DSLFolderNotSetException();
        }
        if (StringUtils.isBlank(name)) {
            return null;
        }
        if (!dslFolder.exists()) {
            throw new DSLFolderNotValidException("DSL folder does not exist:" + dslFolder);
        }
        if (!dslFolder.isDirectory()) {
            throw new DSLFolderNotValidException("DSL folder ist not a directory:" + dslFolder);
        }
        String path = PATTERN_EVERY_DOT.matcher(name).replaceAll("/");
        path += ".xml";
        File sourceFile = new File(dslFolder, path);
        if (!sourceFile.exists()) {
            throw new FileNotFoundException("Did not found:" + sourceFile);
        }
        InputStream stream = new FileInputStream(sourceFile);

        Type type = typeImporter.importType(stream);

        return type;
    }

    @Override
    public Set<Plugin> loadPlugins() throws IOException {
        if (dslFolder == null) {
            throw new DSLFolderNotSetException();
        }
        if (!dslFolder.exists()) {
            throw new DSLFolderNotValidException("DSL folder does not exist:" + dslFolder);
        }
        if (!dslFolder.isDirectory()) {
            throw new DSLFolderNotValidException("DSL folder ist not a directory:" + dslFolder);
        }
        File sourceFile = new File(dslFolder, "plugins.xml");
        if (!sourceFile.exists()) {
            throw new FileNotFoundException("Did not found:" + sourceFile);
        }
        try (InputStream stream = new FileInputStream(sourceFile)) {
            XMLPlugins xmlPlugins = pluginsImporter.importPlugins(stream);
            Set<Plugin> plugins = xmlPlugins.getPlugins();
            return plugins;

        }

    }

    @Override
    public Map<String, String> loadApiMappings() throws IOException {
        Map<String, String> alternative;
        Map<String, String> origin;
        /* first load alternate origin mapping */
        File apiMappingFile = new File(dslFolder, "api-mapping.txt");
        try (InputStream stream = new FileInputStream(apiMappingFile)) {
            origin = apiMappingImporter.importMapping(stream);
        }
        File alternativeApiMappingFile = new File(dslFolder, "alternative-api-mapping.txt");
        if (!alternativeApiMappingFile.exists()) {
            return origin;
        }
        try (InputStream stream = new FileInputStream(alternativeApiMappingFile)) {
            alternative = apiMappingImporter.importMapping(stream);
        }
        /* merge results, origin api wins, if there are conflicts */
        Map<String, String> result = alternative;
        result.putAll(origin);
        return result;
    }

    public class DSLFolderNotSetException extends IOException {

        private static final long serialVersionUID = 1L;

    }

    private class DSLFolderNotValidException extends IOException {

        private DSLFolderNotValidException(String message) {
            super(message);
        }

        private static final long serialVersionUID = 1L;

    }

}