collectionproxy.java

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// Copyright (c) Corporation for National Research Initiatives

package org.python.core;
import java.util.*;

class CollectionProxy {
    public static final CollectionProxy NoProxy = new EnumerationProxy(null);

    private static boolean checkedJava2 = false;
    private static CollectionProxy java2Proxy = null;
    public CollectionProxy instanceFindCollection(Object object) {
        return null;
    }

    public static CollectionProxy findCollection(Object object) {
        if (object == null) return NoProxy;

        if (!checkedJava2) {
            checkedJava2 = true;
            try {
                Class c = Class.forName("org.python.core.CollectionProxy2");
                Class.forName("java.util.Collection");
                java2Proxy = (CollectionProxy)c.newInstance();
            } catch (Throwable t) { }
        }
        if (java2Proxy != null) {
            CollectionProxy ret = java2Proxy.instanceFindCollection(object);
            if (ret != null) return ret;
        }

        if (object instanceof Vector) {
            return new VectorProxy(((Vector)object));
        }
        if (object instanceof Enumeration) {
            return new EnumerationProxy(((Enumeration)object));
        }
        if (object instanceof Dictionary) {
            return new DictionaryProxy(((Dictionary)object));
        }

        return NoProxy;
    }

    /**The basic functions to implement a mapping**/
    public int __len__() {
        throw Py.AttributeError("__len__");
    }

    public PyObject __finditem__(int key) {
        return __finditem__(new PyInteger(key));
    }

    public PyObject __finditem__(PyObject key) {
        throw Py.AttributeError("__getitem__");
    }

    public PyObject __getitem__(int key) {
        PyObject ret = __finditem__(key);
        if (ret == null) throw Py.KeyError(""+key);
        return ret;
    }

    public PyObject __getitem__(PyObject key) {
        PyObject ret = __finditem__(key);
        if (ret == null) throw Py.KeyError(key.toString());
        return ret;
    }

    public void __setitem__(PyObject key, PyObject value) {
        throw Py.AttributeError("__setitem__");
    }
    public void __delitem__(PyObject key) {
        throw Py.AttributeError("__delitem__");
    }
}

class EnumerationProxy extends CollectionProxy {
    Enumeration proxy;
    int counter;


    public EnumerationProxy(Enumeration proxy) {
        this.proxy = proxy;
        counter=0;
    }

    public PyObject __finditem__(int key) {
        if (key != counter) {
            throw Py.ValueError(
                "enumeration indices must be consecutive ints starting at 0");
        }
        counter++;
        if (proxy.hasMoreElements()) {
            return Py.java2py(proxy.nextElement());
        } else {
            return null;
        }
    }

    public PyObject __finditem__(PyObject key) {
        if (key instanceof PyInteger) {
            return __finditem__(((PyInteger)key).getValue());
        } else {
            throw Py.TypeError("only integer keys accepted");
        }
    }
}

class VectorProxy extends CollectionProxy {
    Vector proxy;

    public VectorProxy(Vector proxy) {
        this.proxy = proxy;
    }

    public int __len__() {
        return proxy.size();
    }


    public PyObject __finditem__(int key) {
        try {
            return Py.java2py(proxy.elementAt(key));
        } catch (ArrayIndexOutOfBoundsException exc) {
            return null;
        }
    }

    public PyObject __finditem__(PyObject key) {
        if (key instanceof PyInteger) {
            return __finditem__(((PyInteger)key).getValue());
        } else {
            throw Py.TypeError("only integer keys accepted");
        }
    }

    public void __setitem__(PyObject key, PyObject value) {
        if (key instanceof PyInteger) {
            proxy.setElementAt(Py.tojava(value, Object.class),
                               ((PyInteger)key).getValue());
        } else {
            throw Py.TypeError("only integer keys accepted");
        }
    }
    public void __delitem__(PyObject key) {
        if (key instanceof PyInteger) {
            proxy.removeElementAt(((PyInteger)key).getValue());
        } else {
            throw Py.TypeError("only integer keys accepted");
        }
    }
}

class DictionaryProxy extends CollectionProxy {
    Dictionary proxy;

    public DictionaryProxy(Dictionary proxy) {
        this.proxy = proxy;
    }

    public int __len__() {
        return proxy.size();
    }

    public PyObject __finditem__(int key) {
        throw Py.TypeError("loop over non-sequence");
    }

    public PyObject __finditem__(PyObject key) {
        return Py.java2py(proxy.get(Py.tojava(key, Object.class)));
    }

    public void __setitem__(PyObject key, PyObject value) {
        proxy.put(Py.tojava(key, Object.class),
                  Py.tojava(value, Object.class));
    }

    public void __delitem__(PyObject key) {
        proxy.remove(Py.tojava(key, Object.class));
    }
}