Source Code Cross Referenced for PythMelder.java in  » Science » Cougaar12_4 » org » cougaar » lib » aggagent » script » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.lib.aggagent.script 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * <copyright>
003:         *  
004:         *  Copyright 2003-2004 BBNT Solutions, LLC
005:         *  under sponsorship of the Defense Advanced Research Projects
006:         *  Agency (DARPA).
007:         * 
008:         *  You can redistribute this software and/or modify it under the
009:         *  terms of the Cougaar Open Source License as published on the
010:         *  Cougaar Open Source Website (www.cougaar.org).
011:         * 
012:         *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
013:         *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
014:         *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
015:         *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
016:         *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
017:         *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
018:         *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
019:         *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
020:         *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
021:         *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
022:         *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
023:         *  
024:         * </copyright>
025:         */
026:
027:        package org.cougaar.lib.aggagent.script;
028:
029:        import java.util.List;
030:
031:        import org.cougaar.lib.aggagent.query.CompoundKey;
032:        import org.cougaar.lib.aggagent.query.DataAtomMelder;
033:        import org.python.core.PyFunction;
034:        import org.python.core.PyObject;
035:        import org.python.util.PythonInterpreter;
036:
037:        /**
038:         *  An implementation of DataAtomMelder that derives its functionality from a
039:         *  script written in the JPython language.  A PythMelder is configured in two
040:         *  stages:  one is to declare a function or class, and the other is to pass
041:         *  the function or an instance of the class to the controlling Java context.
042:         *  <br><br>
043:         *  The necessity of using a two-stage initialization procedure for both types
044:         *  of PythMelder implementations is due to JPython's resolute refusal to
045:         *  allow an expression to declare a new function or class (or, indeed, any
046:         *  multiline construct).  One possibility is to use a "magic" function through
047:         *  which the Java and JPython contexts can communicate.  For the sake of
048:         *  uniformity, this option is used here.  The magic function is "instantiate",
049:         *  which the script should define in the global context as a no-arg function
050:         *  that returns either an DataAtomMelder instance or a function designed to
051:         *  act as the "aggregate" method of an DataAtomMelder.
052:         *  <br><br>
053:         *  This class implements the DataAtomMelder interface, and can be instantiated
054:         *  by calling the constructor or a static factory method, melderFromScript().
055:         */
056:        public class PythMelder implements  DataAtomMelder {
057:            // This is the JPython instruction evaluated to retrieve the product of the
058:            // script.  The script is responsible for providing the correct behavior to
059:            // the named function.
060:            private static String MAGIC_FUNCTION = "instantiate()";
061:
062:            // DataAtomMelder implementation that uses a JPython script as its aggregate
063:            // method.
064:            private static class Func implements  DataAtomMelder {
065:                private PyFunction delegateFunction = null;
066:
067:                public Func(PyFunction f) {
068:                    delegateFunction = f;
069:                }
070:
071:                public void meld(List idNames, CompoundKey id, List atoms,
072:                        List output) {
073:                    delegateFunction._jcall(new Object[] { idNames, id, atoms,
074:                            output });
075:                }
076:            }
077:
078:            // Each instance carrys a delegate DataAtomMelder derived from a script
079:            private DataAtomMelder delegate = null;
080:
081:            /**
082:             *  Create a PythMelder instance by using a script-generated DataAtomMelder
083:             *  as a delegate.
084:             *  @param script the JPython script that defines the embodied functionality
085:             */
086:            public PythMelder(String script) {
087:                delegate = melderFromScript(script);
088:            }
089:
090:            /**
091:             *  An implementation of the aggregate method of interface DataAtomMelder. The
092:             *  function is actually delegated to a script-generated implementation,
093:             *  which is fabricated in the constructor.
094:             *
095:             *  @param idNames a list of names for the identifier fields
096:             */
097:            public void meld(List idNames, CompoundKey id, List atoms,
098:                    List output) {
099:                delegate.meld(idNames, id, atoms, output);
100:            }
101:
102:            /**
103:             *  Create an DataAtomMelder from a JPython script.  There are two acceptable
104:             *  modes for the script.  It must produce either a JPython subclass of Java
105:             *  interface DataAtomMelder or a JPython function that behaves like the method
106:             *  DataAtomMelder.aggregate().  Either way, the script is required to define the
107:             *  magic function "instantiate()" to provide the function or DataAtomMelder
108:             *  instance to the Java context.
109:             *
110:             *  @param script the executable script that declares classes and variables
111:             *  @return an DataAtomMelder instance derived from the JPython scripts
112:             */
113:            public static DataAtomMelder melderFromScript(String script) {
114:                PythonInterpreter pi = new NoErrorPython();
115:                if (script != null)
116:                    pi.exec(script);
117:                PyObject product = pi.eval(MAGIC_FUNCTION);
118:                if (product instanceof  PyFunction) {
119:                    return new Func((PyFunction) product);
120:                } else {
121:                    Object obj = product.__tojava__(DataAtomMelder.class);
122:                    if (obj instanceof  DataAtomMelder)
123:                        return (DataAtomMelder) obj;
124:                }
125:                throw new IllegalArgumentException(
126:                        "JPython script did not yield a function or an DataAtomMelder");
127:            }
128:        }
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