Java example source code file (ContentType.java)

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Java - Java tags/keywords

contenttype, headertokenizer, parameterlist, parseexception, string, stringbuffer

The ContentType.java Java example source code

/*
 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 in the LICENSE file that
 * accompanied this code).
 *
 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @(#)ContentType.java       1.7 02/03/27
 */



package com.sun.xml.internal.messaging.saaj.packaging.mime.internet;


/**
 * This class represents a MIME ContentType value. It provides
 * methods to parse a ContentType string into individual components
 * and to generate a MIME style ContentType string.
 *
 * @version 1.7, 02/03/27
 * @author  John Mani
 */
public final class ContentType {

    private String primaryType; // primary type
    private String subType;     // subtype
    private ParameterList list; // parameter list

    /**
     * No-arg Constructor.
     */
    public ContentType() { }

    /**
     * Constructor.
     *
     * @param   primaryType     primary type
     * @param   subType subType
     * @param   list    ParameterList
     */
    public ContentType(String primaryType, String subType,
                       ParameterList list) {
        this.primaryType = primaryType;
        this.subType = subType;
        if (list == null)
            list = new ParameterList();
        this.list = list;
    }

    /**
     * Constructor that takes a Content-Type string. The String
     * is parsed into its constituents: primaryType, subType
     * and parameters. A ParseException is thrown if the parse fails.
     *
     * @param   s       the Content-Type string.
     * @exception       ParseException if the parse fails.
     */
    public ContentType(String s) throws ParseException {
        HeaderTokenizer h = new HeaderTokenizer(s, HeaderTokenizer.MIME);
        HeaderTokenizer.Token tk;

        // First "type" ..
        tk = h.next();
        if (tk.getType() != HeaderTokenizer.Token.ATOM)
            throw new ParseException();
        primaryType = tk.getValue();

        // The '/' separator ..
        tk = h.next();
        if ((char)tk.getType() != '/')
            throw new ParseException();

        // Then "subType" ..
        tk = h.next();
        if (tk.getType() != HeaderTokenizer.Token.ATOM)
            throw new ParseException();
        subType = tk.getValue();

        // Finally parameters ..
        String rem = h.getRemainder();
        if (rem != null)
            list = new ParameterList(rem);
    }

    public ContentType copy() {
        return new ContentType(primaryType,subType,list.copy());
    }

    /**
     * Return the primary type.
     * @return the primary type
     */
    public String getPrimaryType() {
        return primaryType;
    }

    /**
     * Return the subType.
     * @return the subType
     */
    public String getSubType() {
        return subType;
    }

    /**
     * Return the MIME type string, without the parameters.
     * The returned value is basically the concatenation of
     * the primaryType, the '/' character and the secondaryType.
     *
     * @return the type
     */
    public String getBaseType() {
        return primaryType + '/' + subType;
    }

    /**
     * Return the specified parameter value. Returns <code>null
     * if this parameter is absent.
     * @return  parameter value
     */
    public String getParameter(String name) {
        if (list == null)
            return null;

        return list.get(name);
    }

    /**
     * Return a ParameterList object that holds all the available
     * parameters. Returns null if no parameters are available.
     *
     * @return  ParameterList
     */
    public ParameterList getParameterList() {
        return list;
    }

    /**
     * Set the primary type. Overrides existing primary type.
     * @param   primaryType     primary type
     */
    public void setPrimaryType(String primaryType) {
        this.primaryType = primaryType;
    }

    /**
     * Set the subType. Overrides existing subType
     * @param   subType subType
     */
    public void setSubType(String subType) {
        this.subType = subType;
    }

    /**
     * Set the specified parameter. If this parameter already exists,
     * it is replaced by this new value.
     *
     * @param   name    parameter name
     * @param   value   parameter value
     */
    public void setParameter(String name, String value) {
        if (list == null)
            list = new ParameterList();

        list.set(name, value);
    }

    /**
     * Set a new ParameterList.
     * @param   list    ParameterList
     */
    public void setParameterList(ParameterList list) {
        this.list = list;
    }

    /**
     * Retrieve a RFC2045 style string representation of
     * this Content-Type. Returns <code>null if
     * the conversion failed.
     *
     * @return  RFC2045 style string
     */
    public String toString() {
        if (primaryType == null || subType == null) // need both
            return null;

        StringBuffer sb = new StringBuffer();
        sb.append(primaryType).append('/').append(subType);
        if (list != null)
        // Http Binding section of the "SOAP with attachments" specification says,
        // "SOAP message senders should send Content-Type headers on a single long line."
        // (http://www.w3.org/TR/SOAP-attachments#HTTPBinding)
            sb.append(list.toString());

        return sb.toString();
    }

    /**
     * Match with the specified ContentType object. This method
     * compares <strong>only the primaryType and
     * <code>subType . The parameters of both operands
     * are ignored. <p>
     *
     * For example, this method will return <code>true when
     * comparing the ContentTypes for <strong>"text/plain"
     * and <strong>"text/plain; charset=foobar".
     *
     * If the <code>subType of either operand is the special
     * character '*', then the subtype is ignored during the match.
     * For example, this method will return <code>true when
     * comparing the ContentTypes for <strong>"text/plain"
     * and <strong>"text/*" 
     *
     * @param   cType to compare this against
     */
    public boolean match(ContentType cType) {
        // Match primaryType
        if (!primaryType.equalsIgnoreCase(cType.getPrimaryType()))
            return false;

        String sType = cType.getSubType();

        // If either one of the subTypes is wildcarded, return true
        if ((subType.charAt(0) == '*') || (sType.charAt(0) == '*'))
            return true;

        // Match subType
        if (!subType.equalsIgnoreCase(sType))
            return false;

        return true;
    }

    /**
     * Match with the specified content-type string. This method
     * compares <strong>only the primaryType and
     * <code>subType .
     * The parameters of both operands are ignored. <p>
     *
     * For example, this method will return <code>true when
     * comparing the ContentType for <strong>"text/plain"
     * with <strong>"text/plain; charset=foobar".
     *
     * If the <code>subType of either operand is the special
     * character '*', then the subtype is ignored during the match.
     * For example, this method will return <code>true when
     * comparing the ContentType for <strong>"text/plain"
     * with <strong>"text/*" 
     */
    public boolean match(String s) {
        try {
            return match(new ContentType(s));
        } catch (ParseException pex) {
            return false;
        }
    }
}