/*
 * $Header: /home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/naming/resources/ResourceAttributes.java,v 1.2 2003/09/02 21:22:03 remm Exp $
 * $Revision: 1.2 $
 * $Date: 2003/09/02 21:22:03 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */ 

package org.apache.naming.resources;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Vector;

import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttribute;

/**
 * Attributes implementation.
 * 
 * @author <a href="mailto:remm@apache.org">Remy Maucherat</a>
 * @version $Revision: 1.2 $
 */
public class ResourceAttributes implements Attributes {
    
    
    // -------------------------------------------------------------- Constants
    
    
    // Default attribute names
    
    /**
     * Creation date.
     */
    public static final String CREATION_DATE = "creationdate";
    
    
    /**
     * Creation date.
     */
    public static final String ALTERNATE_CREATION_DATE = "creation-date";
    
    
    /**
     * Last modification date.
     */
    public static final String LAST_MODIFIED = "getlastmodified";
    
    
    /**
     * Last modification date.
     */
    public static final String ALTERNATE_LAST_MODIFIED = "last-modified";
    
    
    /**
     * Name.
     */
    public static final String NAME = "displayname";
    
    
    /**
     * Type.
     */
    public static final String TYPE = "resourcetype";
    
    
    /**
     * Type.
     */
    public static final String ALTERNATE_TYPE = "content-type";
    
    
    /**
     * Source.
     */
    public static final String SOURCE = "source";
    
    
    /**
     * MIME type of the content.
     */
    public static final String CONTENT_TYPE = "getcontenttype";
    
    
    /**
     * Content language.
     */
    public static final String CONTENT_LANGUAGE = "getcontentlanguage";
    
    
    /**
     * Content length.
     */
    public static final String CONTENT_LENGTH = "getcontentlength";
    
    
    /**
     * Content length.
     */
    public static final String ALTERNATE_CONTENT_LENGTH = "content-length";
    
    
    /**
     * ETag.
     */
    public static final String ETAG = "getetag";
    
    
    /**
     * Collection type.
     */
    public static final String COLLECTION_TYPE = "<collection/>";
    
    
    /**
     * HTTP date format.
     */
    protected static final SimpleDateFormat format =
        new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
    
    
    /**
     * Date formats using for Date parsing.
     */
    protected static final SimpleDateFormat formats[] = {
        new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US),
        new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy", Locale.US),
        new SimpleDateFormat("EEEEEE, dd-MMM-yy HH:mm:ss zzz", Locale.US),
        new SimpleDateFormat("EEE MMMM d HH:mm:ss yyyy", Locale.US)
    };
    
    
    // ----------------------------------------------------------- Constructors
    
    
    /**
     * Default constructor.
     */
    public ResourceAttributes() {
    }
    
    
    /**
     * Merges with another attribute set.
     */
    public ResourceAttributes(Attributes attributes) {
        this.attributes = attributes;
    }
    
    
    // ----------------------------------------------------- Instance Variables


    /**
     * Collection flag.
     */
    protected boolean collection = false;


    /**
     * Content length.
     */
    protected long contentLength = -1;


    /**
     * Creation time.
     */
    protected long creation = -1;


    /**
     * Creation date.
     */
    protected Date creationDate = null;


    /**
     * Last modified time.
     */
    protected long lastModified = -1;


    /**
     * Last modified date.
     */
    protected Date lastModifiedDate = null;


    /**
     * Name.
     */
    protected String name = null;


    /**
     * Weak ETag.
     */
    protected String weakETag = null;


    /**
     * Strong ETag.
     */
    protected String strongETag = null;


    /**
     * External attributes.
     */
    protected Attributes attributes = null;


    // ------------------------------------------------------------- Properties


    /**
     * Is collection.
     */
    public boolean isCollection() {
        if (attributes != null) {
            return (getResourceType().equals(COLLECTION_TYPE));
        } else {
            return (collection);
        }
    }
    
    
    /**
     * Set collection flag.
     * 
     * @return value of the collection flag
     */
    public void setCollection(boolean collection) {
        this.collection = collection;
        if (attributes != null) {
            String value = "";
            if (collection)
                value = COLLECTION_TYPE;
            attributes.put(TYPE, value);
        }
    }
    
    
    /**
     * Get content length.
     * 
     * @return content length value
     */
    public long getContentLength() {
        if (contentLength != -1L)
            return contentLength;
        if (attributes != null) {
            Attribute attribute = attributes.get(CONTENT_LENGTH);
            if (attribute != null) {
                try {
                    Object value = attribute.get();
                    if (value instanceof Long) {
                        contentLength = ((Long) value).longValue();
                    } else {
                        try {
                            contentLength = Long.parseLong(value.toString());
                        } catch (NumberFormatException e) {
                            ; // Ignore
                        }
                    }
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        return contentLength;
    }
    
    
    /**
     * Set content length.
     * 
     * @param contentLength New content length value
     */
    public void setContentLength(long contentLength) {
        this.contentLength = contentLength;
        if (attributes != null)
            attributes.put(CONTENT_LENGTH, new Long(contentLength));
    }
    
    
    /**
     * Get creation time.
     * 
     * @return creation time value
     */
    public long getCreation() {
        if (creation != -1L)
            return creation;
        if (creationDate != null)
            return creationDate.getTime();
        if (attributes != null) {
            Attribute attribute = attributes.get(CREATION_DATE);
            if (attribute != null) {
                try {
                    Object value = attribute.get();
                    if (value instanceof Long) {
                        creation = ((Long) value).longValue();
                    } else if (value instanceof Date) {
                        creation = ((Date) value).getTime();
                        creationDate = (Date) value;
                    } else {
                        String creationDateValue = value.toString();
                        Date result = null;
                        // Parsing the HTTP Date
                        for (int i = 0; (result == null) && 
                                 (i < formats.length); i++) {
                            try {
                                result = formats[i].parse(creationDateValue);
                            } catch (ParseException e) {
                                ;
                            }
                        }
                        if (result != null) {
                            creation = result.getTime();
                            creationDate = result;
                        }
                    }
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        return creation;
    }
    
    
    /**
     * Set creation.
     * 
     * @param creation New creation value
     */
    public void setCreation(long creation) {
        this.creation = creation;
        this.creationDate = null;
        if (attributes != null)
            attributes.put(CREATION_DATE, new Date(creation));
    }
    
    
    /**
     * Get creation date.
     * 
     * @return Creation date value
     */
    public Date getCreationDate() {
        if (creationDate != null)
            return creationDate;
        if (creation != -1L) {
            creationDate = new Date(creation);
            return creationDate;
        }
        if (attributes != null) {
            Attribute attribute = attributes.get(CREATION_DATE);
            if (attribute != null) {
                try {
                    Object value = attribute.get();
                    if (value instanceof Long) {
                        creation = ((Long) value).longValue();
                        creationDate = new Date(creation);
                    } else if (value instanceof Date) {
                        creation = ((Date) value).getTime();
                        creationDate = (Date) value;
                    } else {
                        String creationDateValue = value.toString();
                        Date result = null;
                        // Parsing the HTTP Date
                        for (int i = 0; (result == null) && 
                                 (i < formats.length); i++) {
                            try {
                                result = formats[i].parse(creationDateValue);
                            } catch (ParseException e) {
                                ;
                            }
                        }
                        if (result != null) {
                            creation = result.getTime();
                            creationDate = result;
                        }
                    }
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        return creationDate;
    }
    
    
    /**
     * Creation date mutator.
     * 
     * @param creationDate New creation date
     */
    public void setCreationDate(Date creationDate) {
        this.creation = creationDate.getTime();
        this.creationDate = creationDate;
        if (attributes != null)
            attributes.put(CREATION_DATE, creationDate);
    }
    
    
    /**
     * Get last modified time.
     * 
     * @return lastModified time value
     */
    public long getLastModified() {
        if (lastModified != -1L)
            return lastModified;
        if (lastModifiedDate != null)
            return lastModifiedDate.getTime();
        if (attributes != null) {
            Attribute attribute = attributes.get(LAST_MODIFIED);
            if (attribute != null) {
                try {
                    Object value = attribute.get();
                    if (value instanceof Long) {
                        lastModified = ((Long) value).longValue();
                    } else if (value instanceof Date) {
                        lastModified = ((Date) value).getTime();
                        lastModifiedDate = (Date) value;
                    } else {
                        String lastModifiedDateValue = value.toString();
                        Date result = null;
                        // Parsing the HTTP Date
                        for (int i = 0; (result == null) && 
                                 (i < formats.length); i++) {
                            try {
                                result = 
                                    formats[i].parse(lastModifiedDateValue);
                            } catch (ParseException e) {
                                ;
                            }
                        }
                        if (result != null) {
                            lastModified = result.getTime();
                            lastModifiedDate = result;
                        }
                    }
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        return lastModified;
    }
    
    
    /**
     * Set last modified.
     * 
     * @param lastModified New last modified value
     */
    public void setLastModified(long lastModified) {
        this.lastModified = lastModified;
        this.lastModifiedDate = null;
        if (attributes != null)
            attributes.put(LAST_MODIFIED, new Date(lastModified));
    }
    
    
    /**
     * Set last modified date.
     * 
     * @param lastModified New last modified date value
     * @deprecated
     */
    public void setLastModified(Date lastModified) {
        setLastModifiedDate(lastModified);
    }


    /**
     * Get lastModified date.
     * 
     * @return LastModified date value
     */
    public Date getLastModifiedDate() {
        if (lastModifiedDate != null)
            return lastModifiedDate;
        if (lastModified != -1L) {
            lastModifiedDate = new Date(lastModified);
            return lastModifiedDate;
        }
        if (attributes != null) {
            Attribute attribute = attributes.get(LAST_MODIFIED);
            if (attribute != null) {
                try {
                    Object value = attribute.get();
                    if (value instanceof Long) {
                        lastModified = ((Long) value).longValue();
                        lastModifiedDate = new Date(lastModified);
                    } else if (value instanceof Date) {
                        lastModified = ((Date) value).getTime();
                        lastModifiedDate = (Date) value;
                    } else {
                        String lastModifiedDateValue = value.toString();
                        Date result = null;
                        // Parsing the HTTP Date
                        for (int i = 0; (result == null) && 
                                 (i < formats.length); i++) {
                            try {
                                result = 
                                    formats[i].parse(lastModifiedDateValue);
                            } catch (ParseException e) {
                                ;
                            }
                        }
                        if (result != null) {
                            lastModified = result.getTime();
                            lastModifiedDate = result;
                        }
                    }
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        return lastModifiedDate;
    }
    
    
    /**
     * Last modified date mutator.
     * 
     * @param lastModifiedDate New last modified date
     */
    public void setLastModifiedDate(Date lastModifiedDate) {
        this.lastModified = lastModifiedDate.getTime();
        this.lastModifiedDate = lastModifiedDate;
        if (attributes != null)
            attributes.put(LAST_MODIFIED, lastModifiedDate);
    }
    
    
    /**
     * Get name.
     * 
     * @return Name value
     */
    public String getName() {
        if (name != null)
            return name;
        if (attributes != null) {
            Attribute attribute = attributes.get(NAME);
            if (attribute != null) {
                try {
                    name = attribute.get().toString();
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        return name;
    }


    /**
     * Set name.
     * 
     * @param name New name value
     */
    public void setName(String name) {
        this.name = name;
        if (attributes != null)
            attributes.put(NAME, name);
    }
    
    
    /**
     * Get resource type.
     * 
     * @return String resource type
     */
    public String getResourceType() {
        String result = null;
        if (attributes != null) {
            Attribute attribute = attributes.get(TYPE);
            if (attribute != null) {
                try {
                    result = attribute.get().toString();
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        if (result == null) {
            if (collection)
                result = COLLECTION_TYPE;
            else
                result = "";
        }
        return result;
    }
    
    
    /**
     * Type mutator.
     * 
     * @param resourceType New resource type
     */
    public void setResourceType(String resourceType) {
        collection = resourceType.equals(COLLECTION_TYPE);
        if (attributes != null)
            attributes.put(TYPE, resourceType);
    }


    /**
     * Get ETag.
     * 
     * @return Weak ETag
     */
    public String getETag() {
        return getETag(false);
    }


    /**
     * Get ETag.
     * 
     * @param strong If true, the strong ETag will be returned
     * @return ETag
     */
    public String getETag(boolean strong) {
        String result = null;
        if (attributes != null) {
            Attribute attribute = attributes.get(ETAG);
            if (attribute != null) {
                try {
                    result = attribute.get().toString();
                } catch (NamingException e) {
                    ; // No value for the attribute
                }
            }
        }
        if (strong) {
            // The strong ETag must always be calculated by the resources
            result = strongETag;
        } else {
            // The weakETag is contentLenght + lastModified
            if (weakETag == null) {
                weakETag = "W/\"" + getContentLength() + "-" 
                    + getLastModified() + "\"";
            }
            result = weakETag;
        }
        return result;
    }


    /**
     * Set strong ETag.
     */
    public void setETag(String eTag) {
        this.strongETag = eTag;
        if (attributes != null)
            attributes.put(ETAG, eTag);
    }

    
    // ----------------------------------------------------- Attributes Methods


    /**
     * Get attribute.
     */
    public Attribute get(String attrID) {
        if (attributes == null) {
            if (attrID.equals(CREATION_DATE)) {
                return new BasicAttribute(CREATION_DATE, getCreationDate());
            } else if (attrID.equals(ALTERNATE_CREATION_DATE)) {
                return new BasicAttribute(ALTERNATE_CREATION_DATE, 
                                          getCreationDate());
            } else if (attrID.equals(LAST_MODIFIED)) {
                return new BasicAttribute(LAST_MODIFIED, 
                                          getLastModifiedDate());
            } else if (attrID.equals(ALTERNATE_LAST_MODIFIED)) {
                return new BasicAttribute(ALTERNATE_LAST_MODIFIED,
                                          getLastModifiedDate());
            } else if (attrID.equals(NAME)) {
                return new BasicAttribute(NAME, getName());
            } else if (attrID.equals(TYPE)) {
                return new BasicAttribute(TYPE, getResourceType());
            } else if (attrID.equals(ALTERNATE_TYPE)) {
                return new BasicAttribute(ALTERNATE_TYPE, getResourceType());
            } else if (attrID.equals(CONTENT_LENGTH)) {
                return new BasicAttribute(CONTENT_LENGTH, 
                                          new Long(getContentLength()));
            } else if (attrID.equals(ALTERNATE_CONTENT_LENGTH)) {
                return new BasicAttribute(ALTERNATE_CONTENT_LENGTH, 
                                          new Long(getContentLength()));
            }
        } else {
            return attributes.get(attrID);
        }
        return null;
    }
    
    
    /**
     * Put attribute.
     */
    public Attribute put(Attribute attribute) {
        if (attributes == null) {
            try {
                return put(attribute.getID(), attribute.get());
            } catch (NamingException e) {
                return null;
            }
        } else {
            return attributes.put(attribute);
        }
    }
    
    
    /**
     * Put attribute.
     */
    public Attribute put(String attrID, Object val) {
        if (attributes == null) {
            return null; // No reason to implement this
        } else {
            return attributes.put(attrID, val);
        }
    }
    
    
    /**
     * Remove attribute.
     */
    public Attribute remove(String attrID) {
        if (attributes == null) {
            return null; // No reason to implement this
        } else {
            return attributes.remove(attrID);
        }
    }
    
    
    /**
     * Get all attributes.
     */
    public NamingEnumeration getAll() {
        if (attributes == null) {
            Vector attributes = new Vector();
            attributes.addElement(new BasicAttribute
                                  (CREATION_DATE, getCreationDate()));
            attributes.addElement(new BasicAttribute
                                  (LAST_MODIFIED, getLastModifiedDate()));
            attributes.addElement(new BasicAttribute(NAME, getName()));
            attributes.addElement(new BasicAttribute(TYPE, getResourceType()));
            attributes.addElement
                (new BasicAttribute(CONTENT_LENGTH, 
                                    new Long(getContentLength())));
            return new RecyclableNamingEnumeration(attributes);
        } else {
            return attributes.getAll();
        }
    }
    
    
    /**
     * Get all attribute IDs.
     */
    public NamingEnumeration getIDs() {
        if (attributes == null) {
            Vector attributeIDs = new Vector();
            attributeIDs.addElement(CREATION_DATE);
            attributeIDs.addElement(LAST_MODIFIED);
            attributeIDs.addElement(NAME);
            attributeIDs.addElement(TYPE);
            attributeIDs.addElement(CONTENT_LENGTH);
            return new RecyclableNamingEnumeration(attributeIDs);
        } else {
            return attributes.getIDs();
        }
    }
    
    
    /**
     * Retrieves the number of attributes in the attribute set.
     */
    public int size() {
        if (attributes == null) {
            return 5;
        } else {
            return attributes.size();
        }
    }
    
    
    /**
     * Clone the attributes object (WARNING: fake cloning).
     */
    public Object clone() {
        return this;
    }
    
    
    /**
     * Case sensitivity.
     */
    public boolean isCaseIgnored() {
        return false;
    }
    
    
}
