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