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Apache POI - Java API To Access Microsoft Format Files
/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF 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.apache.poi.openxml4j.opc.internal;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
/**
* Represents a immutable MIME ContentType value (RFC 2616 §3.7)
*
* media-type = type "/" subtype *( ";" parameter ) type = token
* subtype = token
*
* Rule M1.13 : Package implementers shall only create and only recognize parts
* with a content type; format designers shall specify a content type for each
* part included in the format. Content types for package parts shall fit the
* definition and syntax for media types as specified in RFC 2616, \§3.7.
*
* Rule M1.14: Content types shall not use linear white space either between the
* type and subtype or between an attribute and its value. Content types also
* shall not have leading or trailing white spaces. Package implementers shall
* create only such content types and shall require such content types when
* retrieving a part from a package; format designers shall specify only such
* content types for inclusion in the format.
*
* @author Julien Chable
* @version 0.1
*
* @see http://www.ietf.org/rfc/rfc2045.txt
* @see http://www.ietf.org/rfc/rfc2616.txt
*/
public final class ContentType {
/**
* Type in Type/Subtype.
*/
private final String type;
/**
* Subtype
*/
private final String subType;
/**
* Parameters
*/
private final Map parameters;
/**
* Media type compiled pattern, without parameters
*/
private final static Pattern patternTypeSubType;
/**
* Media type compiled pattern, with parameters.
*/
private final static Pattern patternTypeSubTypeParams;
/**
* Pattern to match on just the parameters part, to work
* around the Java Regexp group capture behaviour
*/
private final static Pattern patternParams;
static {
/*
* token = 1*
*
* separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" |
* <"> | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT
*
* CTL =
*
* CHAR =
*/
String token = "[\\x21-\\x7E&&[^\\(\\)<>@,;:\\\\/\"\\[\\]\\?={}\\x20\\x09]]";
/*
* parameter = attribute "=" value
*
* attribute = token
*
* value = token | quoted-string
*/
String parameter = "(" + token + "+)=(\"?" + token + "+\"?)";
/*
* Pattern for media type.
*
* Don't allow comment, rule M1.15: The package implementer shall
* require a content type that does not include comments and the format
* designer shall specify such a content type.
*
* comment = "(" *( ctext | quoted-pair | comment ) ")"
*
* ctext =
*
* TEXT =
*
* LWS = [CRLF] 1*( SP | HT )
*
* CR =
*
* LF =
*
* SP =
*
* HT =
*
* quoted-pair = "\" CHAR
*/
patternTypeSubType = Pattern.compile("^(" + token + "+)/(" +
token + "+)$");
patternTypeSubTypeParams = Pattern.compile("^(" + token + "+)/(" +
token + "+)(;" + parameter + ")*$");
patternParams = Pattern.compile(";" + parameter);
}
/**
* Constructor. Check the input with the RFC 2616 grammar.
*
* @param contentType
* The content type to store.
* @throws InvalidFormatException
* If the specified content type is not valid with RFC 2616.
*/
public ContentType(String contentType) throws InvalidFormatException {
Matcher mMediaType = patternTypeSubType.matcher(contentType);
if (!mMediaType.matches()) {
// How about with parameters?
mMediaType = patternTypeSubTypeParams.matcher(contentType);
}
if (!mMediaType.matches()) {
throw new InvalidFormatException(
"The specified content type '"
+ contentType
+ "' is not compliant with RFC 2616: malformed content type.");
}
// Type/subtype
if (mMediaType.groupCount() >= 2) {
this.type = mMediaType.group(1);
this.subType = mMediaType.group(2);
// Parameters
this.parameters = new HashMap();
// Java RegExps are unhelpful, and won't do multiple group captures
// See http://docs.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html#cg
if (mMediaType.groupCount() >= 5) {
Matcher mParams = patternParams.matcher(contentType.substring(mMediaType.end(2)));
while (mParams.find()) {
this.parameters.put(mParams.group(1), mParams.group(2));
}
}
} else {
// missing media type and subtype
this.type = "";
this.subType = "";
this.parameters = Collections.emptyMap();
}
}
/**
* Returns the content type as a string, including parameters
*/
@Override
public final String toString() {
return toString(true);
}
public final String toString(boolean withParameters) {
StringBuffer retVal = new StringBuffer();
retVal.append(this.getType());
retVal.append("/");
retVal.append(this.getSubType());
if (withParameters) {
for (Entry me : parameters.entrySet()) {
retVal.append(";");
retVal.append(me.getKey());
retVal.append("=");
retVal.append(me.getValue());
}
}
return retVal.toString();
}
@Override
public boolean equals(Object obj) {
return (!(obj instanceof ContentType))
|| (this.toString().equalsIgnoreCase(obj.toString()));
}
@Override
public int hashCode() {
return this.toString().hashCode();
}
/* Getters */
/**
* Get the subtype.
*
* @return The subtype of this content type.
*/
public String getSubType() {
return this.subType;
}
/**
* Get the type.
*
* @return The type of this content type.
*/
public String getType() {
return this.type;
}
/**
* Does this content type have any parameters associated with it?
*/
public boolean hasParameters() {
return (parameters != null) && !parameters.isEmpty();
}
/**
* Return the parameter keys
*/
public String[] getParameterKeys() {
if (parameters == null)
return new String[0];
return parameters.keySet().toArray(new String[parameters.size()]);
}
/**
* Gets the value associated to the specified key.
*
* @param key
* The key of the key/value pair.
* @return The value associated to the specified key.
*/
public String getParameter(String key) {
return parameters.get(key);
}
}