org.toobsframework.transformpipeline.domain.XSLUriResolverImpl.java Source code

Introduction

Here is the source code for org.toobsframework.transformpipeline.domain.XSLUriResolverImpl.java

Source

/*
 * This file is licensed to the Toobs Framework Group under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The Toobs Framework Group 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.toobsframework.transformpipeline.domain;

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.io.Resource;
import org.toobsframework.util.Configuration;

import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;

public class XSLUriResolverImpl implements URIResolver, ApplicationContextAware, InitializingBean {
    private static final Log log = LogFactory.getLog(XSLUriResolverImpl.class);

    public static String COMPONENT_MANAGER_XSL = "component-manager.xsl";

    protected ApplicationContext applicationContext;
    protected Configuration configuration;
    protected Map<String, URL> sourceMap;
    private List<String> contextBase;
    private List<String> classpathBase;

    private boolean doReload;

    public XSLUriResolverImpl() {
    }

    public XSLUriResolverImpl(List<String> contextBase, List<String> classpathBase) {
        this.contextBase = contextBase;
        this.classpathBase = classpathBase;
    }

    public void afterPropertiesSet() throws Exception {
        if (this.classpathBase == null) {
            this.classpathBase = new ArrayList<String>();
            this.classpathBase.add("xsl/");
        }
        if (this.contextBase == null) {
            this.contextBase = new ArrayList<String>();
            this.contextBase.add("/WEB-INF/xsl/");
        }
        sourceMap = new ConcurrentHashMap<String, URL>();
        sourceMap.put(COMPONENT_MANAGER_XSL, resolveClasspathResource(COMPONENT_MANAGER_XSL, ""));
        this.doReload = configuration.doReload();
    }

    public Source resolve(String xslFile, String base) throws TransformerException {
        if (log.isDebugEnabled()) {
            log.debug("ENTER XSLUriResolverImpl.resolve('" + xslFile + "', '" + base + "');");
        }

        Source xslSource = null;
        URL xslUrl = sourceMap.get(xslFile);
        try {
            if (xslUrl == null || doReload) {
                if (applicationContext != null) {
                    xslUrl = resolveContextResource(xslFile, "");
                }
                if (xslUrl == null) {
                    xslUrl = resolveClasspathResource(xslFile, "");
                }
                if (xslUrl == null) {
                    throw new TransformerException("xsl " + xslFile + " not found");
                }
                sourceMap.put(xslFile, xslUrl);
            }

            xslSource = new StreamSource(xslUrl.openStream());
            xslSource.setSystemId(xslUrl.getPath());
        } catch (IOException e) {
            log.error("XSL File " + xslFile + " had IOException " + e.getMessage(), e);
            throw new TransformerException("xsl " + xslFile + " cannot be loaded");
        }

        if (log.isDebugEnabled()) {
            log.debug("EXIT XSLUriResolverImpl.resolve('" + xslFile + "', '" + base + "');");
        }
        return xslSource;
    }

    protected URL resolveContextResource(String xslFile, String string) throws IOException {
        Resource configFileURL = null;
        String systemId = null;
        for (int i = 0; i < this.contextBase.size(); i++) {
            systemId = this.contextBase.get(i) + xslFile;

            if (log.isDebugEnabled()) {
                log.debug("Checking for: " + systemId);
            }
            configFileURL = applicationContext.getResource(systemId);

            if (null != configFileURL) {
                break;
            }
        }
        if (configFileURL.exists()) {
            return configFileURL.getURL();
        }
        return null;
    }

    protected URL resolveClasspathResource(String xslFile, String base) throws TransformerException {
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();

        URL configFileURL = null;
        String systemId = null;
        for (int i = 0; i < this.classpathBase.size(); i++) {
            systemId = this.classpathBase.get(i) + xslFile;

            if (log.isDebugEnabled()) {
                log.debug("Checking for: " + systemId);
            }
            configFileURL = classLoader.getResource(systemId);

            if (null != configFileURL) {
                break;
            }
        }

        return configFileURL;
    }

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public void setDoReload(boolean doReload) {
        this.doReload = doReload;
    }

    public void setContextBase(List<String> contextBase) {
        this.contextBase = contextBase;
    }

    public void setClasspathBase(List<String> classpathBase) {
        this.classpathBase = classpathBase;
    }

    public void setConfiguration(Configuration configuration) {
        this.configuration = configuration;
    }
}