com.nominanuda.springsoy.SoySource.java Source code

Introduction

Here is the source code for com.nominanuda.springsoy.SoySource.java

Source

/*
 * Copyright 2008-2011 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
 * 
 *      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 com.nominanuda.springsoy;

import java.io.BufferedReader;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.StringReader;
import java.net.URL;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.springframework.core.io.Resource;

import com.google.template.soy.SoyFileSet;
import com.google.template.soy.jssrc.SoyJsSrcOptions;
import com.google.template.soy.msgs.SoyMsgBundle;
import com.google.template.soy.msgs.SoyMsgBundleHandler;
import com.google.template.soy.msgs.SoyMsgException;
import com.google.template.soy.tofu.SoyTofu;
import com.google.template.soy.xliffmsgplugin.XliffMsgPlugin;
import com.nominanuda.code.Nullable;
import com.nominanuda.lang.Check;
import com.nominanuda.lang.Collections;
import com.nominanuda.lang.Strings;

public class SoySource {
    private final static Pattern FUNC_DECL = Pattern.compile("^\\s*([\\.\\w]+)\\s*=\\s*function\\s*\\(");
    private final static String NULL_LANG_KEY = "NO LANGUAGE";
    private boolean cache = true;
    private Resource templatesLocation;
    private ConcurrentHashMap<String, Map<String, String>> jsTemplatesCache = new ConcurrentHashMap<String, Map<String, String>>();
    private ConcurrentHashMap<String, SoyTofu> tofuCache = new ConcurrentHashMap<String, SoyTofu>();
    private Set<String> functionNames = new HashSet<String>();
    private String i18nXlfUrl;
    private boolean i18n = false;

    private Set<String> skipLangs = Collections.emptySet();

    public String getJsTemplate(String name, @Nullable String lang) throws IOException {
        lang = Check.ifNull(lang, NULL_LANG_KEY);
        if (jsTemplatesCache.get(lang) == null || !cache) {
            compile(lang);
        }
        Map<String, String> tpls = jsTemplatesCache.get(lang);
        String tpl = tpls.get(name);
        if (tpl == null) {
            throw new IOException("not found template named " + name);
        }
        return tpl;
    }

    public boolean hasFunction(String name, @Nullable String lang) throws IOException {
        lang = Check.ifNull(lang, NULL_LANG_KEY);
        if (jsTemplatesCache.get(lang) == null || !cache) {
            compile(lang);
        }
        return functionNames.contains(name);
    }

    public SoyTofu getSoyTofu(@Nullable String lang) throws IOException {
        lang = Check.ifNull(lang, NULL_LANG_KEY);
        if (tofuCache.get(lang) == null || !cache) {
            compile(lang);
        }
        return tofuCache.get(lang);
    }

    private void compile(String lang) throws IOException {
        File[] templateFiles = templatesLocation.getFile().listFiles(new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return name.endsWith(".soy");
            }
        });
        SoyFileSet.Builder builder = new SoyFileSet.Builder();
        List<String> jsTplNames = new LinkedList<String>();
        for (File templateFile : templateFiles) {
            builder.add(templateFile);
            jsTplNames.add(templateFile.getName());
        }
        SoyFileSet soyFileSet = builder.build();
        List<String> jsTpls = soyFileSet.compileToJsSrc(new SoyJsSrcOptions(), getBundle(lang));
        for (String jsSrc : jsTpls) {
            BufferedReader br = new BufferedReader(new StringReader(jsSrc));
            String line;
            while ((line = br.readLine()) != null) {
                Matcher m = FUNC_DECL.matcher(line);
                if (m.find()) {
                    functionNames.add(m.group(1));
                }
            }
        }
        Map<String, String> jsTplMap = new HashMap<String, String>();
        int len = jsTplNames.size();
        for (int i = 0; i < len; i++) {
            jsTplMap.put(jsTplNames.get(i), jsTpls.get(i));
        }
        jsTemplatesCache.put(lang, jsTplMap);
        tofuCache.put(lang, soyFileSet.compileToTofu());
    }

    public @Nullable SoyMsgBundle getBundle(String lang) throws SoyMsgException, IOException {
        if (!i18n || lang == null || skipLangs.contains(lang)) {
            return null;
        } else {
            SoyMsgBundleHandler msgBundleHandler = new SoyMsgBundleHandler(new XliffMsgPlugin());
            SoyMsgBundle msgBundle = msgBundleHandler.createFromResource(new URL(i18nXlfUrl + "." + lang + ".xlf"));
            return msgBundle;
        }
    }

    public void setTemplatesLocation(Resource templatesLocation) {
        this.templatesLocation = templatesLocation;
    }

    public void setCache(boolean cache) {
        this.cache = cache;
    }

    /**
     * 
     * @param i18nXlfBaseUrl e.g. classpath:/com/foo/messages which for Locale en becomes classpath:/com/foo/messages.en.xlf
     */
    public void setI18nXlfBaseUrl(String i18nXlfBaseUrl) {
        this.i18nXlfUrl = i18nXlfBaseUrl;
    }

    /**
     * 
     * @param skipLangs list of locales to skip (i.e. not to translate) comma separated
     */
    public void setSkipLangs(String skipLangs) {
        this.skipLangs = new HashSet<String>(Strings.splitAndTrim(skipLangs, ","));
    }

    /**
     * @param i18n enable translation, default is false
     */
    public void setI18n(boolean i18n) {
        this.i18n = i18n;
    }

}