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samples/BufferArray.java@2f1b9f4daec1 (annotated)

samples/BufferArray.java

Fri, 05 Jun 2015 12:38:53 +0200

author

mhaupt

date

Fri, 05 Jun 2015 12:38:53 +0200

changeset 1398

2f1b9f4daec1

parent 1028

d79265f2fa92

permissions

-rw-r--r--

8080087: Nashorn $ENV.PWD is originally undefined
Summary: On Windows, the PWD environment variable does not exist and cannot be imported in scripting mode, so it is set explicitly.
Reviewed-by: lagergren, sundar

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	*
aoqi@0	4	* Redistribution and use in source and binary forms, with or without
aoqi@0	5	* modification, are permitted provided that the following conditions
aoqi@0	6	* are met:
aoqi@0	7	*
aoqi@0	8	* - Redistributions of source code must retain the above copyright
aoqi@0	9	* notice, this list of conditions and the following disclaimer.
aoqi@0	10	*
aoqi@0	11	* - Redistributions in binary form must reproduce the above copyright
aoqi@0	12	* notice, this list of conditions and the following disclaimer in the
aoqi@0	13	* documentation and/or other materials provided with the distribution.
aoqi@0	14	*
aoqi@0	15	* - Neither the name of Oracle nor the names of its
aoqi@0	16	* contributors may be used to endorse or promote products derived
aoqi@0	17	* from this software without specific prior written permission.
aoqi@0	18	*
aoqi@0	19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
aoqi@0	20	* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
aoqi@0	21	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
aoqi@0	22	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
aoqi@0	23	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
aoqi@0	24	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
aoqi@0	25	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
aoqi@0	26	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
aoqi@0	27	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
aoqi@0	28	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
aoqi@0	29	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
aoqi@0	30	*/
aoqi@0	31
lagergren@1028	32	import java.nio.DoubleBuffer;
aoqi@0	33	import jdk.nashorn.api.scripting.AbstractJSObject;
aoqi@0	34
aoqi@0	35	/**
aoqi@0	36	* Simple class demonstrating pluggable script object
aoqi@0	37	* implementation. By implementing jdk.nashorn.api.scripting.JSObject
aoqi@0	38	* (or extending AbstractJSObject which implements it), you
aoqi@0	39	* can supply a friendly script object. Nashorn will call
aoqi@0	40	* 'magic' methods on such a class on 'obj.foo, obj.foo = 33,
aoqi@0	41	* obj.bar()' etc. from script.
aoqi@0	42	*
aoqi@0	43	* In this example, Java nio DoubleBuffer object is wrapped
aoqi@0	44	* as a friendly script object that provides indexed acces
aoqi@0	45	* to buffer content and also support array-like "length"
aoqi@0	46	* readonly property to retrieve buffer's capacity. This class
aoqi@0	47	* also demonstrates a function valued property called "buf".
aoqi@0	48	* On 'buf' method, we return the underlying nio buffer object
aoqi@0	49	* that is being wrapped.
aoqi@0	50	*/
aoqi@0	51	public class BufferArray extends AbstractJSObject {
aoqi@0	52	// underlying nio buffer
aoqi@0	53	private final DoubleBuffer buf;
aoqi@0	54
lagergren@1028	55	/**
lagergren@1028	56	* Constructor
lagergren@1028	57	* @param size initial size
lagergren@1028	58	*/
lagergren@1028	59	public BufferArray(final int size) {
aoqi@0	60	buf = DoubleBuffer.allocate(size);
aoqi@0	61	}
aoqi@0	62
lagergren@1028	63	/**
lagergren@1028	64	* Constructur
lagergren@1028	65	* @param buf {@link DoubleBuffer} to link to
lagergren@1028	66	*/
lagergren@1028	67	public BufferArray(final DoubleBuffer buf) {
aoqi@0	68	this.buf = buf;
aoqi@0	69	}
aoqi@0	70
aoqi@0	71	// called to check if indexed property exists
aoqi@0	72	@Override
lagergren@1028	73	public boolean hasSlot(final int index) {
aoqi@0	74	return index > 0 && index < buf.capacity();
aoqi@0	75	}
aoqi@0	76
aoqi@0	77	// get the value from that index
aoqi@0	78	@Override
lagergren@1028	79	public Object getSlot(final int index) {
aoqi@0	80	return buf.get(index);
aoqi@0	81	}
aoqi@0	82
aoqi@0	83	// set the value at that index
aoqi@0	84	@Override
lagergren@1028	85	public void setSlot(final int index, final Object value) {
aoqi@0	86	buf.put(index, ((Number)value).doubleValue());
aoqi@0	87	}
aoqi@0	88
aoqi@0	89	// do you have a property of that given name?
aoqi@0	90	@Override
lagergren@1028	91	public boolean hasMember(final String name) {
aoqi@0	92	return "length".equals(name) || "buf".equals(name);
aoqi@0	93	}
aoqi@0	94
aoqi@0	95	// get the value of that named property
aoqi@0	96	@Override
lagergren@1028	97	public Object getMember(final String name) {
aoqi@0	98	switch (name) {
aoqi@0	99	case "length":
aoqi@0	100	return buf.capacity();
aoqi@0	101	case "buf":
aoqi@0	102	// return a 'function' value for this property
aoqi@0	103	return new AbstractJSObject() {
aoqi@0	104	@Override
lagergren@1028	105	public Object call(final Object thiz, final Object... args) {
aoqi@0	106	return BufferArray.this.buf;
aoqi@0	107	}
aoqi@0	108
aoqi@0	109	// yes, I'm a function !
aoqi@0	110	@Override
aoqi@0	111	public boolean isFunction() {
aoqi@0	112	return true;
aoqi@0	113	}
aoqi@0	114	};
lagergren@1028	115	default:
lagergren@1028	116	break;
aoqi@0	117	}
aoqi@0	118	return null;
aoqi@0	119	}
aoqi@0	120	}