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PHPJavaBridge server (soluble fork)
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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.script;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.io.Writer;

import javax.script.ScriptContext;

import io.soluble.pjb.bridge.Util;
import io.soluble.pjb.bridge.http.IContext;
import io.soluble.pjb.bridge.http.WriterOutputStream;


/**
 * A simple ScriptContext which can be used in servlet- or standalone environments.
 *
 * @author jostb
 */
public abstract class AbstractPhpScriptContext extends ScriptContextDecorator implements IPhpScriptContext {

    public AbstractPhpScriptContext(ScriptContext ctx) {
        super(ctx);
    }

    protected Continuation kont;

    /**
     * {@inheritDoc}
     */
    protected Writer writer;

    public Writer getWriter() {
        if (writer == null) writer = super.getWriter();
        if (!(writer instanceof PhpScriptWriter)) setWriter(writer);
        return writer;
    }

    /**
     * {@inheritDoc}
     */
    protected Writer errorWriter;

    public Writer getErrorWriter() {
        if (errorWriter == null) errorWriter = super.getErrorWriter();
        if (!(errorWriter instanceof PhpScriptWriter)) setErrorWriter(errorWriter);
        return errorWriter;
    }


    /**
     * Ignore the default java_context()->call(java_closure()) call at the end
     * of the invocable script, if the user has provided its own.
     */
    private boolean continuationCalled;

    /**
     * {@inheritDoc}
     */
    public void startContinuation() {
        Util.PHP_SCRIPT_ENGINE_THREAD_POOL.start(kont);
    }

    /**
     * {@inheritDoc}
     */
    public void setContinuation(Continuation kont) {
        this.kont = kont;
        continuationCalled = false;
    }

    /**
     * {@inheritDoc}
     */
    public Continuation getContinuation() {
        return kont;
    }

    /**
     * {@inheritDoc}
     */
    public boolean call(Object kont) throws Exception {
        if (!continuationCalled) {
            this.setAttribute(IContext.PHP_PROCEDURE, kont, IContext.ENGINE_SCOPE);
            // prefer the user's java_context()->call(java_closure())
            continuationCalled = true;

            this.kont.call(kont);
        }
        return true;
    }

    /**
     * Sets the Writer for scripts to use when displaying output.
     * TODO: test
     *
     * @param writer The new Writer.
     */
    public void setWriter(Writer writer) {
        super.setWriter(this.writer = new PhpScriptWriter(new WriterOutputStream(writer)));
    }

    /**
     * Sets the Writer used to display error output.
     *
     * @param writer The Writer.
     */
    public void setErrorWriter(Writer writer) {
        super.setErrorWriter(this.errorWriter = new PhpScriptWriter(new WriterOutputStream(writer)));
    }
}