| /* |
| * 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. |
| */ |
| |
| // $Id: Transformer.java 570103 2007-08-27 13:24:55Z mrglavas $ |
| |
| package javax.xml.transform; |
| |
| import java.util.Properties; |
| |
| /** |
| * An instance of this abstract class can transform a |
| * source tree into a result tree. |
| * |
| * <p>An instance of this class can be obtained with the |
| * {@link TransformerFactory#newTransformer TransformerFactory.newTransformer} |
| * 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 <code>Transformer</code> may be used multiple times. Parameters and |
| * output properties are preserved across transformations.</p> |
| * |
| * @author <a href="Jeff.Suttor@Sun.com">Jeff Suttor</a> |
| * @version $Revision: 570103 $, $Date: 2007-08-27 06:24:55 -0700 (Mon, 27 Aug 2007) $ |
| */ |
| public abstract class Transformer { |
| |
| /** |
| * Default constructor is protected on purpose. |
| */ |
| protected Transformer() { } |
| |
| /** |
| * <p>Reset this <code>Transformer</code> to its original configuration.</p> |
| * |
| * <p><code>Transformer</code> is reset to the same state as when it was created with |
| * {@link TransformerFactory#newTransformer()}, |
| * {@link TransformerFactory#newTransformer(Source source)} or |
| * {@link Templates#newTransformer()}. |
| * <code>reset()</code> is designed to allow the reuse of existing <code>Transformer</code>s |
| * thus saving resources associated with the creation of new <code>Transformer</code>s.</p> |
| * |
| * <p>The reset <code>Transformer</code> is not guaranteed to have the same {@link URIResolver} |
| * or {@link ErrorListener} <code>Object</code>s, e.g. {@link Object#equals(Object obj)}. |
| * It is guaranteed to have a functionally equal <code>URIResolver</code> |
| * and <code>ErrorListener</code>.</p> |
| * |
| * @since 1.5 |
| */ |
| public void reset() { |
| |
| // implementors should override this method |
| throw new UnsupportedOperationException( |
| "This Transformer, \"" + this.getClass().getName() + "\", does not support the reset functionality." |
| + " Specification \"" + this.getClass().getPackage().getSpecificationTitle() + "\"" |
| + " version \"" + this.getClass().getPackage().getSpecificationVersion() + "\"" |
| ); |
| } |
| |
| /** |
| * <p>Transform the XML <code>Source</code> to a <code>Result</code>. |
| * Specific transformation behavior is determined by the settings of the |
| * <code>TransformerFactory</code> in effect when the |
| * <code>Transformer</code> was instantiated and any modifications made to |
| * the <code>Transformer</code> instance.</p> |
| * |
| * <p>An empty <code>Source</code> is represented as an empty document |
| * as constructed by {@link javax.xml.parsers.DocumentBuilder#newDocument()}. |
| * The result of transforming an empty <code>Source</code> depends on |
| * the transformation behavior; it is not always an empty |
| * <code>Result</code>.</p> |
| * |
| * @param xmlSource The XML input to transform. |
| * @param outputTarget The <code>Result</code> of transforming the |
| * <code>xmlSource</code>. |
| * |
| * @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 coercion or to simply |
| * pass the object on for use in an extension. |
| * |
| * @throws NullPointerException If value is null. |
| */ |
| public abstract void setParameter(String name, Object value); |
| |
| /** |
| * Get a parameter that was explicitly set with setParameter. |
| * |
| * <p>This method does not return a default parameter value, which |
| * cannot be determined until the node context is evaluated during |
| * the transformation process. |
| * |
| * @param name of <code>Object</code> to get |
| * @return A parameter that has been set with setParameter. |
| */ |
| public abstract Object getParameter(String name); |
| |
| /** |
| * <p>Set a list of parameters.</p> |
| * |
| * <p>Note that the list of parameters is specified as a |
| * <code>Properties</code> <code>Object</code> which limits the parameter |
| * values to <code>String</code>s. Multiple calls to |
| * {@link #setParameter(String name, Object value)} should be used when the |
| * desired values are non-<code>String</code> <code>Object</code>s. |
| * The parameter names should conform as specified in |
| * {@link #setParameter(String name, Object value)}. |
| * An <code>IllegalArgumentException</code> is thrown if any names do not |
| * conform.</p> |
| * |
| * <p>New parameters in the list are added to any existing parameters. |
| * If the name of a new parameter is equal to the name of an existing |
| * parameter as determined by {@link java.lang.Object#equals(Object obj)}, |
| * the existing parameter is set to the new value.</p> |
| * |
| * @param params Parameters to set. |
| * |
| * @throws IllegalArgumentException If any parameter names do not conform |
| * to the naming rules. |
| */ |
| |
| /** |
| * 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 transformer will no longer have a resolver.</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(). |
| * |
| * @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> |
| * An <code>IllegalArgumentException</code> is thrown if any of the |
| * argument keys are not recognized and are not namespace qualified. |
| * |
| * @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 |
| * |
| */ |
| public abstract void setOutputProperties(Properties oformat); |
| |
| /** |
| * <p>Get a copy of the output properties for the transformation.</p> |
| * |
| * <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 transformer contains.</p> |
| * |
| * <p>If any of the argument keys are not recognized and are not |
| * namespace qualified, the property will be ignored and not returned. |
| * In other words the behavior is not orthogonal with |
| * {@link #setOutputProperties setOutputProperties}.</p> |
| * |
| * @return A copy of the set of output properties in effect for |
| * the next transformation. |
| * |
| * @see javax.xml.transform.OutputKeys |
| * @see java.util.Properties |
| * @see <a href="http://www.w3.org/TR/xslt#output"> |
| * XSL Transformations (XSLT) Version 1.0</a> |
| */ |
| 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 |
| * transformer. 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. |
| * Implementations must provide a default error listener. |
| * |
| * @return The current error handler, which should never be null. |
| */ |
| public abstract ErrorListener getErrorListener(); |
| } |
