mimeentry.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 343 行

/*
 * @(#)MimeEntry.java	1.32 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.  
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
 *   
 * This program is free software; you can redistribute it and/or  
 * modify it under the terms of the GNU General Public License version  
 * 2 only, as published by the Free Software Foundation.   
 *   
 * This program is distributed in the hope that it will be useful, but  
 * WITHOUT ANY WARRANTY; without even the implied warranty of  
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
 * General Public License version 2 for more details (a copy is  
 * included at /legal/license.txt).   
 *   
 * You should have received a copy of the GNU General Public License  
 * version 2 along with this work; if not, write to the Free Software  
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
 * 02110-1301 USA   
 *   
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
 * Clara, CA 95054 or visit www.sun.com if you need additional  
 * information or have any questions. 
 *
 */

package sun.net.www;
import java.net.URL;
import java.io.*;
import java.util.StringTokenizer;

public class MimeEntry implements Cloneable {
    public static final String defaultImagePath = "doc:/lib/images/ftp";

    private String typeName;	// of the form: "type/subtype"
    private String tempFileNameTemplate;

    private int action;
    private String command;
    private String description;
    private String imageFileName;
    private String fileExtensions[];

    boolean starred;

    // Actions
    public static final int		UNKNOWN			= 0;
    public static final int		LOAD_INTO_BROWSER	= 1;
    public static final int		SAVE_TO_FILE		= 2;
    public static final int		LAUNCH_APPLICATION	= 3;

    static final String[] actionKeywords = {
	"unknown",
	"browser",
	"save",
	"application",
    };

    /**
     * Construct an empty entry of the given type and subtype.
     */
    public MimeEntry(String type) {
	// Default action is UNKNOWN so clients can decide what the default
	// should be, typically save to file or ask user.
	this(type, UNKNOWN, null, null, null);
    }

    //
    // The next two constructors are used only by the deprecated
    // PlatformMimeTable classes or, in last case, is called by the public
    // constructor.  They are kept here anticipating putting support for
    // mailcap formatted config files back in (so BOTH the properties format
    // and the mailcap formats are supported).
    //
    MimeEntry(String type, String imageFileName, String extensionString) {
	typeName = type.toLowerCase();
	action = UNKNOWN;
	command = null;
	this.imageFileName = imageFileName;
	setExtensions(extensionString);
	starred = isStarred(typeName);
    }

    // For use with MimeTable::parseMailCap
    MimeEntry(String typeName, int action, String command,
	      String tempFileNameTemplate) {
	this.typeName = typeName.toLowerCase();
	this.action = action;
	this.command = command;
	this.imageFileName = null;
	this.fileExtensions = null;

	this.tempFileNameTemplate = tempFileNameTemplate;
    }

    // This is the one called by the public constructor.
    MimeEntry(String typeName, int action, String command,
	      String imageFileName, String fileExtensions[]) {

	this.typeName = typeName.toLowerCase();
	this.action = action;
	this.command = command;
	this.imageFileName = imageFileName;
	this.fileExtensions = fileExtensions;

	starred = isStarred(typeName);

    }

    public synchronized String getType() {
	return typeName;
    }

    public synchronized void setType(String type) {
	typeName = type.toLowerCase();
    }

    public synchronized int getAction() {
	return action;
    }

    public synchronized void setAction(int action, String command) {
	this.action = action;
	this.command = command;
    }

    public synchronized void setAction(int action) {
	this.action = action;
    }

    public synchronized String getLaunchString() {
	return command;
    }

    public synchronized void setCommand(String command) {
	this.command = command;
    }

    public synchronized String getDescription() {
	return (description != null ? description : typeName);
    }

    public synchronized void setDescription(String description) {
	this.description = description;
    }

    // ??? what to return for the image -- the file name or should this return
    // something more advanced like an image source or something?
    // returning the name has the least policy associated with it.
    // pro tempore, we'll use the name
    public String getImageFileName() {
	return imageFileName;
    }

    public synchronized void setImageFileName(String filename) {
	File file = new File(filename);
	if (file.getParent() == null) {
	    imageFileName = System.getProperty(
                                     "java.net.ftp.imagepath."+filename);
	}
	else {
	    imageFileName = filename;
	}

	if (filename.lastIndexOf('.') < 0) {
	    imageFileName = imageFileName + ".gif";
	}
    }

    public String getTempFileTemplate() {
	return tempFileNameTemplate;
    }

    public synchronized String[] getExtensions() {
	return fileExtensions;
    }

    public synchronized String getExtensionsAsList() {
	String extensionsAsString = "";
	if (fileExtensions != null) {
	    for (int i = 0; i < fileExtensions.length; i++) {
		extensionsAsString += fileExtensions[i];
		if (i < (fileExtensions.length - 1)) {
		    extensionsAsString += ",";
		}
	    }
	}

	return extensionsAsString;
    }

    public synchronized void setExtensions(String extensionString) {
	StringTokenizer extTokens = new StringTokenizer(extensionString, ",");
	int numExts = extTokens.countTokens();
	String extensionStrings[] = new String[numExts];

	for (int i = 0; i < numExts; i++) {
	    String ext = (String)extTokens.nextElement();
	    extensionStrings[i] = ext.trim();
	}

	fileExtensions = extensionStrings;
    }

    private boolean isStarred(String typeName) {
	return (typeName != null)
	    && (typeName.length() > 0)
	    && (typeName.endsWith("/*"));
    }

    /**
     * Invoke the MIME type specific behavior for this MIME type.
     * Returned value can be one of several types:
     * <ol>
     * <li>A thread -- the caller can choose when to launch this thread.
     * <li>A string -- the string is loaded into the browser directly.
     * <li>An input stream -- the caller can read from this byte stream and
     *     will typically store the results in a file.
     * <li>A document (?) --
     * </ol>
     */
    public Object launch(java.net.URLConnection urlc, InputStream is, MimeTable mt) throws ApplicationLaunchException {
	switch (action) {
	case SAVE_TO_FILE:
	    // is this really the right thing to do?
	    try {
		return is;
	    } catch(Exception e) {
		// I18N
		return "Load to file failed:\n" + e;
	    }

	case LOAD_INTO_BROWSER:
	    // invoke the content handler?
	    // may be the right thing to do, may not be -- short term
	    // where docs are not loaded asynch, loading and returning
	    // the content is the right thing to do.
	    try {
		return urlc.getContent();
	    } catch (Exception e) {
		return null;
	    }

	case LAUNCH_APPLICATION:
	    {
		String threadName = command;
		int fst = threadName.indexOf(' ');
		if (fst > 0) {
		    threadName = threadName.substring(0, fst);
		}

		return new MimeLauncher(this, urlc, is,
					mt.getTempFileTemplate(), threadName);
	    }

	case UNKNOWN:
	    return null;
	}

	return null;
    }

    public boolean matches(String type) {
	if (starred) {
	  return type.startsWith(typeName);
	} else {
	    return type.equals(typeName);
	}
    }

    public Object clone() {
	// return a shallow copy of this.
	MimeEntry theClone = new MimeEntry(typeName);
	theClone.action = action;
	theClone.command = command;
	theClone.description = description;
	theClone.imageFileName = imageFileName;
	theClone.tempFileNameTemplate = tempFileNameTemplate;
	theClone.fileExtensions = fileExtensions;

	return theClone;
    }

    public synchronized String toProperty() {
	StringBuffer buf = new StringBuffer();

	String separator = "; ";
	boolean needSeparator = false;

	int action = getAction();
	if (action != MimeEntry.UNKNOWN) {
	    buf.append("action=" + actionKeywords[action]);
	    needSeparator = true;
	}

	String command = getLaunchString();
	if (command != null && command.length() > 0) {
	    if (needSeparator) {
		buf.append(separator);
	    }
	    buf.append("application=" + command);
	    needSeparator = true;
	}

	if (getImageFileName() != null) {
	    if (needSeparator) {
		buf.append(separator);
	    }
	    buf.append("icon=" + getImageFileName());
	    needSeparator = true;
	}

	String extensions = getExtensionsAsList();
	if (extensions.length() > 0) {
	    if (needSeparator) {
		buf.append(separator);
	    }
	    buf.append("file_extensions=" + extensions);
	    needSeparator = true;
	}

	String description = getDescription();
	if (description != null && !description.equals(getType())) {
	    if (needSeparator) {
		buf.append(separator);
	    }
	    buf.append("description=" + description);
	}

	return buf.toString();
    }

    public String toString() {
	return "MimeEntry[contentType=" + typeName
	    + ", image=" + imageFileName
	    + ", action=" + action
	    + ", command=" + command
	    + ", extensions=" + getExtensionsAsList()
	    + "]";
    }
}