001: /*
002: * Copyright (c) 2003 The Visigoth Software Society. All rights
003: * reserved.
004: *
005: * Redistribution and use in source and binary forms, with or without
006: * modification, are permitted provided that the following conditions
007: * are met:
008: *
009: * 1. Redistributions of source code must retain the above copyright
010: * notice, this list of conditions and the following disclaimer.
011: *
012: * 2. Redistributions in binary form must reproduce the above copyright
013: * notice, this list of conditions and the following disclaimer in
014: * the documentation and/or other materials provided with the
015: * distribution.
016: *
017: * 3. The end-user documentation included with the redistribution, if
018: * any, must include the following acknowledgement:
019: * "This product includes software developed by the
020: * Visigoth Software Society (http://www.visigoths.org/)."
021: * Alternately, this acknowledgement may appear in the software itself,
022: * if and wherever such third-party acknowledgements normally appear.
023: *
024: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
025: * project contributors may be used to endorse or promote products derived
026: * from this software without prior written permission. For written
027: * permission, please contact visigoths@visigoths.org.
028: *
029: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030: * nor may "FreeMarker" or "Visigoth" appear in their names
031: * without prior written permission of the Visigoth Software Society.
032: *
033: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044: * SUCH DAMAGE.
045: * ====================================================================
046: *
047: * This software consists of voluntary contributions made by many
048: * individuals on behalf of the Visigoth Software Society. For more
049: * information on the Visigoth Software Society, please see
050: * http://www.visigoths.org/
051: */
052:
053: package freemarker.template.utility;
054:
055: import java.io.IOException;
056: import java.io.Writer;
057: import java.util.Map;
058: import org.python.core.PyObject;
059: import org.python.util.PythonInterpreter;
060: import freemarker.template.TemplateTransformModel;
061: import freemarker.core.Environment;
062:
063: /**
064: * A crude first pass at an embeddable Jython interpreter
065: * @author <mailto:jon@revusky.com>Jonathan Revusky</a>
066: */
067:
068: public class JythonRuntime extends PythonInterpreter implements
069: TemplateTransformModel {
070: public Writer getWriter(final Writer out, final Map args) {
071: final StringBuffer buf = new StringBuffer();
072: final Environment env = Environment.getCurrentEnvironment();
073: return new Writer() {
074: public void write(char cbuf[], int off, int len) {
075: buf.append(cbuf, off, len);
076: }
077:
078: public void flush() throws IOException {
079: interpretBuffer();
080: out.flush();
081: }
082:
083: public void close() {
084: interpretBuffer();
085: }
086:
087: private void interpretBuffer() {
088: synchronized (JythonRuntime.this ) {
089: PyObject prevOut = systemState.stdout;
090: try {
091: setOut(out);
092: set("env", env);
093: exec(buf.toString());
094: buf.setLength(0);
095: } finally {
096: setOut(prevOut);
097: }
098: }
099: }
100: };
101: }
102: }
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