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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2023 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.style;

import net.sf.saxon.expr.Expression;
import net.sf.saxon.om.AttributeInfo;
import net.sf.saxon.om.NodeName;
import net.sf.saxon.trans.XPathException;

public class XSLMergeAction extends StyleElement {

    /**
     * Determine whether this node is an instruction.
     *
     * @return true - it is an instruction
     */

    @Override
    public boolean isInstruction() {
        return false;
    }

    /**
     * Determine whether this type of element is allowed to contain a sequence constructor
     *
     * @return true: yes, it may contain a sequence constructor
     */

    @Override
    protected boolean mayContainSequenceConstructor() {
        return true;
    }

    @Override
    public Expression compile(Compilation exec, ComponentDeclaration decl)
            throws XPathException {
        Expression content = compileSequenceConstructor(exec, decl, true);

        return content;


    }

    @Override
    protected void prepareAttributes() {
        for (AttributeInfo att : attributes()) {
            NodeName attName = att.getNodeName();
            checkUnknownAttribute(attName);
        }

    }

    @Override
    public void validate(ComponentDeclaration decl) throws XPathException {
        if (!(getParent() instanceof XSLMerge)) {
            compileError("xsl:merge-action may appear only as a child of xsl:merge", "XTSE0010");
        }
    }

}