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118 lines
3.9 KiB
118 lines
3.9 KiB
/*
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* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.script;
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import java.util.Map;
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/**
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* Extended by classes that store results of compilations. State
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* might be stored in the form of Java classes, Java class files or scripting
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* language opcodes. The script may be executed repeatedly
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* without reparsing.
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* <br><br>
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* Each <code>CompiledScript</code> is associated with a <code>ScriptEngine</code> -- A call to an <code>eval</code>
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* method of the <code>CompiledScript</code> causes the execution of the script by the
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* <code>ScriptEngine</code>. Changes in the state of the <code>ScriptEngine</code> caused by execution
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* of the <code>CompiledScript</code> may visible during subsequent executions of scripts by the engine.
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*
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* @author Mike Grogan
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* @since 1.6
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*/
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public abstract class CompiledScript {
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/**
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* Executes the program stored in this <code>CompiledScript</code> object.
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*
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* @param context A <code>ScriptContext</code> that is used in the same way as
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* the <code>ScriptContext</code> passed to the <code>eval</code> methods of
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* <code>ScriptEngine</code>.
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*
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* @return The value returned by the script execution, if any. Should return <code>null</code>
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* if no value is returned by the script execution.
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*
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* @throws ScriptException if an error occurs.
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* @throws NullPointerException if context is null.
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*/
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public abstract Object eval(ScriptContext context) throws ScriptException;
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/**
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* Executes the program stored in the <code>CompiledScript</code> object using
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* the supplied <code>Bindings</code> of attributes as the <code>ENGINE_SCOPE</code> of the
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* associated <code>ScriptEngine</code> during script execution. If bindings is null,
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* then the effect of calling this method is same as that of eval(getEngine().getContext()).
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* <p>.
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* The <code>GLOBAL_SCOPE</code> <code>Bindings</code>, <code>Reader</code> and <code>Writer</code>
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* associated with the default <code>ScriptContext</code> of the associated <code>ScriptEngine</code> are used.
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*
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* @param bindings The bindings of attributes used for the <code>ENGINE_SCOPE</code>.
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*
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* @return The return value from the script execution
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*
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* @throws ScriptException if an error occurs.
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*/
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public Object eval(Bindings bindings) throws ScriptException {
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ScriptContext ctxt = getEngine().getContext();
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if (bindings != null) {
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SimpleScriptContext tempctxt = new SimpleScriptContext();
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tempctxt.setBindings(bindings, ScriptContext.ENGINE_SCOPE);
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tempctxt.setBindings(ctxt.getBindings(ScriptContext.GLOBAL_SCOPE),
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ScriptContext.GLOBAL_SCOPE);
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tempctxt.setWriter(ctxt.getWriter());
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tempctxt.setReader(ctxt.getReader());
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tempctxt.setErrorWriter(ctxt.getErrorWriter());
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ctxt = tempctxt;
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}
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return eval(ctxt);
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}
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/**
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* Executes the program stored in the <code>CompiledScript</code> object. The
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* default <code>ScriptContext</code> of the associated <code>ScriptEngine</code> is used.
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* The effect of calling this method is same as that of eval(getEngine().getContext()).
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*
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* @return The return value from the script execution
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*
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* @throws ScriptException if an error occurs.
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*/
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public Object eval() throws ScriptException {
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return eval(getEngine().getContext());
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}
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/**
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* Returns the <code>ScriptEngine</code> whose <code>compile</code> method created this <code>CompiledScript</code>.
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* The <code>CompiledScript</code> will execute in this engine.
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*
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* @return The <code>ScriptEngine</code> that created this <code>CompiledScript</code>
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*/
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public abstract ScriptEngine getEngine();
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}
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