/*
* 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 acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" 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 name, without prior written
* permission of the Apache Software Foundation.
*
* 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 and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
/**
* $Id$
*/
package javax.xml.transform;
import java.util.Properties;
/**
* An instace of this abstract class can transform a
* source tree into a result tree.
*
* <p>An instance of this class can be obtained with the <code>
* TransformerFactory.newTransformer</code> method. This instance may
* then be used to process XML from a variety of sources and write
* the transformation output to a variety of sinks.</p>
*
* <p>An object of this class may not be used in multiple threads
* running concurrently. Different Transformers may be used
* concurrently by different threads.</p>
*
* <p>A Transformer may be used multiple times. Parameters and
* output properties are preserved across transformations.</p>
*/
public abstract class Transformer {
/**
* Default constructor is protected on purpose.
*/
protected Transformer() {}
/**
* Process the source tree to the output result.
* @param xmlSource The input for the source tree.
* @param outputTarget The output target.
*
* @throws TransformerException If an unrecoverable error occurs
* during the course of the transformation.
*/
public abstract void transform(Source xmlSource, Result outputTarget)
throws TransformerException;
/**
* Add a parameter for the transformation.
*
* <p>Pass a qualified name as a two-part string, the namespace URI
* enclosed in curly braces ({}), followed by the local name. If the
* name has a null URL, the String only contain the local name. An
* application can safely check for a non-null URI by testing to see if the first
* character of the name is a '{' character.</p>
* <p>For example, if a URI and local name were obtained from an element
* defined with <xyz:foo xmlns:xyz="http://xyz.foo.com/yada/baz.html"/>,
* then the qualified name would be "{http://xyz.foo.com/yada/baz.html}foo". Note that
* no prefix is used.</p>
*
* @param name The name of the parameter, which may begin with a namespace URI
* in curly braces ({}).
* @param value The value object. This can be any valid Java object. It is
* up to the processor to provide the proper object coersion or to simply
* pass the object on for use in an extension.
*/
public abstract void setParameter(String name, Object value);
/**
* Get a parameter that was explicitly set with setParameter
* or setParameters.
*
* <p>This method does not return a default parameter value, which
* cannot be determined until the node context is evaluated during
* the transformation process.
*
* @return A parameter that has been set with setParameter, or null if
* a parameter with the given name was not found.
*/
public abstract Object getParameter(String name);
/**
* Clear all parameters set with setParameter.
*/
public abstract void clearParameters();
/**
* Set an object that will be used to resolve URIs used in
* document().
*
* <p>If the resolver argument is null, the URIResolver value will
* be cleared, and the default behavior will be used.</p>
*
* @param resolver An object that implements the URIResolver interface,
* or null.
*/
public abstract void setURIResolver(URIResolver resolver);
/**
* Get an object that will be used to resolve URIs used in
* document(), etc.
*
* @return An object that implements the URIResolver interface,
* or null.
*/
public abstract URIResolver getURIResolver();
/**
* Set the output properties for the transformation. These
* properties will override properties set in the Templates
* with xsl:output.
*
* <p>If argument to this function is null, any properties
* previously set are removed, and the value will revert to the value
* defined in the templates object.</p>
*
* <p>Pass a qualified property key name as a two-part string, the namespace URI
* enclosed in curly braces ({}), followed by the local name. If the
* name has a null URL, the String only contain the local name. An
* application can safely check for a non-null URI by testing to see if the first
* character of the name is a '{' character.</p>
* <p>For example, if a URI and local name were obtained from an element
* defined with <xyz:foo xmlns:xyz="http://xyz.foo.com/yada/baz.html"/>,
* then the qualified name would be "{http://xyz.foo.com/yada/baz.html}foo". Note that
* no prefix is used.</p>
*
* @param oformat A set of output properties that will be
* used to override any of the same properties in affect
* for the transformation.
*
* @see javax.xml.transform.OutputKeys
* @see java.util.Properties
*
* @throws IllegalArgumentException if any of the argument keys are not
* recognized and are not namespace qualified.
*/
public abstract void setOutputProperties(Properties oformat)
throws IllegalArgumentException;
/**
* Get a copy of the output properties for the transformation.
*
* <p>The properties returned should contain properties set by the user,
* and properties set by the stylesheet, and these properties
* are "defaulted" by default properties specified by <a href="http://www.w3.org/TR/xslt#output">section 16 of the
* XSL Transformations (XSLT) W3C Recommendation</a>. The properties that
* were specifically set by the user or the stylesheet should be in the base
* Properties list, while the XSLT default properties that were not
* specifically set should be the default Properties list. Thus,
* getOutputProperties().getProperty(String key) will obtain any
* property in that was set by {@link #setOutputProperty},
* {@link #setOutputProperties}, in the stylesheet, <em>or</em> the default
* properties, while
* getOutputProperties().get(String key) will only retrieve properties
* that were explicitly set by {@link #setOutputProperty},
* {@link #setOutputProperties}, or in the stylesheet.</p>
*
* <p>Note that mutation of the Properties object returned will not
* effect the properties that the transformation contains.</p>
*
* <p>If any of the argument keys are not recognized and are not
* namespace qualified, the property will be ignored. In other words the
* behaviour is not orthogonal with setOutputProperties.</p>
*
* @returns A copy of the set of output properties in effect
* for the next transformation.
*
* @see javax.xml.transform.OutputKeys
* @see java.util.Properties
*/
public abstract Properties getOutputProperties();
/**
* Set an output property that will be in effect for the
* transformation.
*
* <p>Pass a qualified property name as a two-part string, the namespace URI
* enclosed in curly braces ({}), followed by the local name. If the
* name has a null URL, the String only contain the local name. An
* application can safely check for a non-null URI by testing to see if the first
* character of the name is a '{' character.</p>
* <p>For example, if a URI and local name were obtained from an element
* defined with <xyz:foo xmlns:xyz="http://xyz.foo.com/yada/baz.html"/>,
* then the qualified name would be "{http://xyz.foo.com/yada/baz.html}foo". Note that
* no prefix is used.</p>
*
* <p>The Properties object that was passed to {@link #setOutputProperties} won't
* be effected by calling this method.</p>
*
* @param name A non-null String that specifies an output
* property name, which may be namespace qualified.
* @param value The non-null string value of the output property.
*
* @throws IllegalArgumentException If the property is not supported, and is
* not qualified with a namespace.
*
* @see javax.xml.transform.OutputKeys
*/
public abstract void setOutputProperty(String name, String value)
throws IllegalArgumentException;
/**
* Get an output property that is in effect for the
* transformation. The property specified may be a property
* that was set with setOutputProperty, or it may be a
* property specified in the stylesheet.
*
* @param name A non-null String that specifies an output
* property name, which may be namespace qualified.
*
* @return The string value of the output property, or null
* if no property was found.
*
* @throws IllegalArgumentException If the property is not supported.
*
* @see javax.xml.transform.OutputKeys
*/
public abstract String getOutputProperty(String name)
throws IllegalArgumentException;
/**
* Set the error event listener in effect for the transformation.
*
* @param listener The new error listener.
* @throws IllegalArgumentException if listener is null.
*/
public abstract void setErrorListener(ErrorListener listener)
throws IllegalArgumentException;
/**
* Get the error event handler in effect for the transformation.
*
* @return The current error handler, which should never be null.
*/
public abstract ErrorListener getErrorListener();
}