aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  *
aoqi@0:  * Redistribution and use in source and binary forms, with or without
aoqi@0:  * modification, are permitted provided that the following conditions
aoqi@0:  * are met:
aoqi@0:  *
aoqi@0:  *   - Redistributions of source code must retain the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer.
aoqi@0:  *
aoqi@0:  *   - Redistributions in binary form must reproduce the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer in the
aoqi@0:  *     documentation and/or other materials provided with the distribution.
aoqi@0:  *
aoqi@0:  *   - Neither the name of Oracle nor the names of its
aoqi@0:  *     contributors may be used to endorse or promote products derived
aoqi@0:  *     from this software without specific prior written permission.
aoqi@0:  *
aoqi@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
aoqi@0:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
aoqi@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
aoqi@0:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
aoqi@0:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
aoqi@0:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
aoqi@0:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
aoqi@0:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
aoqi@0:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
aoqi@0:  */
aoqi@0: 
lagergren@1028: import java.nio.DoubleBuffer;
aoqi@0: import jdk.nashorn.api.scripting.AbstractJSObject;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Simple class demonstrating pluggable script object
aoqi@0:  * implementation. By implementing jdk.nashorn.api.scripting.JSObject
aoqi@0:  * (or extending AbstractJSObject which implements it), you
aoqi@0:  * can supply a friendly script object. Nashorn will call
aoqi@0:  * 'magic' methods on such a class on 'obj.foo, obj.foo = 33,
aoqi@0:  * obj.bar()' etc. from script.
aoqi@0:  *
aoqi@0:  * In this example, Java nio DoubleBuffer object is wrapped
aoqi@0:  * as a friendly script object that provides indexed acces
aoqi@0:  * to buffer content and also support array-like "length"
aoqi@0:  * readonly property to retrieve buffer's capacity. This class
aoqi@0:  * also demonstrates a function valued property called "buf".
aoqi@0:  * On 'buf' method, we return the underlying nio buffer object
aoqi@0:  * that is being wrapped.
aoqi@0:  */
aoqi@0: public class BufferArray extends AbstractJSObject {
aoqi@0:     // underlying nio buffer
aoqi@0:     private final DoubleBuffer buf;
aoqi@0: 
lagergren@1028:     /**
lagergren@1028:      * Constructor
lagergren@1028:      * @param size initial size
lagergren@1028:      */
lagergren@1028:     public BufferArray(final int size) {
aoqi@0:         buf = DoubleBuffer.allocate(size);
aoqi@0:     }
aoqi@0: 
lagergren@1028:     /**
lagergren@1028:      * Constructur
lagergren@1028:      * @param buf {@link DoubleBuffer} to link to
lagergren@1028:      */
lagergren@1028:     public BufferArray(final DoubleBuffer buf) {
aoqi@0:         this.buf = buf;
aoqi@0:     }
aoqi@0: 
aoqi@0:     // called to check if indexed property exists
aoqi@0:     @Override
lagergren@1028:     public boolean hasSlot(final int index) {
aoqi@0:         return index > 0 && index < buf.capacity();
aoqi@0:     }
aoqi@0: 
aoqi@0:     // get the value from that index
aoqi@0:     @Override
lagergren@1028:     public Object getSlot(final int index) {
aoqi@0:        return buf.get(index);
aoqi@0:     }
aoqi@0: 
aoqi@0:     // set the value at that index
aoqi@0:     @Override
lagergren@1028:     public void setSlot(final int index, final Object value) {
aoqi@0:        buf.put(index, ((Number)value).doubleValue());
aoqi@0:     }
aoqi@0: 
aoqi@0:     // do you have a property of that given name?
aoqi@0:     @Override
lagergren@1028:     public boolean hasMember(final String name) {
aoqi@0:        return "length".equals(name) || "buf".equals(name);
aoqi@0:     }
aoqi@0: 
aoqi@0:     // get the value of that named property
aoqi@0:     @Override
lagergren@1028:     public Object getMember(final String name) {
aoqi@0:        switch (name) {
aoqi@0:           case "length":
aoqi@0:               return buf.capacity();
aoqi@0:           case "buf":
aoqi@0:               // return a 'function' value for this property
aoqi@0:               return new AbstractJSObject() {
aoqi@0:                   @Override
lagergren@1028:                   public Object call(final Object thiz, final Object... args) {
aoqi@0:                       return BufferArray.this.buf;
aoqi@0:                   }
aoqi@0: 
aoqi@0:                   // yes, I'm a function !
aoqi@0:                   @Override
aoqi@0:                   public boolean isFunction() {
aoqi@0:                       return true;
aoqi@0:                   }
aoqi@0:               };
lagergren@1028:           default:
lagergren@1028:               break;
aoqi@0:        }
aoqi@0:        return null;
aoqi@0:     }
aoqi@0: }