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An XProc 1.0 processor
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/*
 * ForEach.java
 *
 * Copyright 2008 Mark Logic Corporation.
 * Portions Copyright 2007 Sun Microsystems, Inc.
 * All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * https://xproc.dev.java.net/public/CDDL+GPL.html or
 * docs/CDDL+GPL.txt in the distribution. See the License for the
 * specific language governing permissions and limitations under the
 * License. When distributing the software, include this License Header
 * Notice in each file and include the License file at docs/CDDL+GPL.txt.
 */

package com.xmlcalabash.extensions;

import com.xmlcalabash.core.XProcConstants;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.model.DeclareStep;
import com.xmlcalabash.model.Environment;
import com.xmlcalabash.model.Input;
import com.xmlcalabash.model.Output;
import net.sf.saxon.s9api.XdmNode;

/**
 *
 * @author ndw
 */
public class UntilUnchanged extends DeclareStep {
    private Output output = null;

    /* Creates a new instance of UntilUnchanged */
    public UntilUnchanged(XProcRuntime xproc, XdmNode node, String name) {
        super(xproc, node, name);
        declaration = this;
        stepType = XProcConstants.cx_until_unchanged;

        Output current = new Output(xproc, node);
        current.setPort("#current");
        current.setSequence(true);
        addOutput(current);
    }

    public boolean isPipeline() {
        return false;
    }

    public DeclareStep getDeclaration() {
        return declaration;
    }

    public void addOutput(Output output) {
        if (this.output != null) {
            throw new XProcException(output.getNode(), "cx:until-unchanged can have only a single output port: " + output.getPort());
        }

        if (!"#current".equals(output.getPort())) {
            this.output = output;
        }
        
        super.addOutput(output);
    }


    @Override
    public boolean loops() {
        return true;
    }

    @Override
    protected void augmentIO() {
        if (getInput("#iteration-source") == null) {
            Input isource = new Input(runtime, node);
            isource.setPort("#iteration-source");
            isource.setPrimary(true);
            isource.setSequence(true);
            addInput(isource);
        }

        super.augmentIO();
    }

    public Output getOutput(String portName) {
        if ("current".equals(portName)) {
            return getOutput("#current");
        } else {
            return super.getOutput(portName);
        }
    }

    public void patchEnvironment(Environment env) {
        env.setDefaultReadablePort(getOutput("#current"));
    }
}