author | weijun |
Tue, 30 Sep 2014 13:38:58 +0800 | |
changeset 26865 | a7c2a3edbffc |
parent 26768 | 751b0f427090 |
child 26886 | 18c744ab4df2 |
permissions | -rw-r--r-- |
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/* |
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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 jdk.nashorn.api.scripting.AbstractJSObject; |
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import java.nio.DoubleBuffer; |
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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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} |
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return null; |
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} |
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} |