nashorn/samples/BufferArray.java
author weijun
Tue, 30 Sep 2014 13:38:58 +0800
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8058657: Add @jdk.Exported to com.sun.jarsigner APIs Reviewed-by: alanb, mchung
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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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}