collectionproxy2.java

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// Copyright (c) Corporation for National Research Initiatives

/* Support for java-1.2 collections
This will only compile with jdk-1.2 or later.
The rest of JPython works just fine with out it, so feel free to
just leave this uncompiled if you're using jdk-1.1.
*/

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

class CollectionProxy2 extends CollectionProxy
{
    public CollectionProxy instanceFindCollection(Object object) {
        if (object instanceof List) {
            return new ListProxy(((List)object));
        }
        if (object instanceof Map) {
            return new MapProxy(((Map)object));
        }
        if (object instanceof Collection) {
            return new IteratorProxy(((Collection)object).iterator());
        }
        if (object instanceof Iterator) {
            return new IteratorProxy(((Iterator)object));
        }

        return null;
    }
}

class ListProxy extends CollectionProxy
{
    List proxy;

    public ListProxy(List proxy) {
        this.proxy = proxy;
    }

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

    public PyObject __finditem__(int key) {
        try {
            return Py.java2py(proxy.get(key));
        } catch (IndexOutOfBoundsException 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__(int key, PyObject value) {
        proxy.set(key, Py.tojava(value, Object.class));
    }

    public void __setitem__(PyObject key, PyObject value) {
        if (key instanceof PyInteger) {
            __setitem__(((PyInteger)key).getValue(), value);
        } else {
            throw Py.TypeError("only integer keys accepted");
        }
    }

    public void __delitem__(int key) {
        proxy.remove(key);
    }

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

class MapProxy extends CollectionProxy
{
    Map proxy;

    public MapProxy(Map 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));
    }
}


class IteratorProxy extends CollectionProxy
{
    Iterator proxy;
    int counter;

    public IteratorProxy(Iterator proxy) {
        this.proxy = proxy;
        counter=0;
    }

    public PyObject __finditem__(int key) {
        if (key != counter) {
            throw Py.ValueError(
                "iterator indices must be consecutive ints starting at 0");
        }
        counter++;
        if (proxy.hasNext()) {
            return Py.java2py(proxy.next());
        } 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");
        }
    }
}