package org.pdf4j.saxon.style;
import org.pdf4j.saxon.expr.Expression;
import org.pdf4j.saxon.expr.StringLiteral;
import org.pdf4j.saxon.instruct.Executable;
import org.pdf4j.saxon.instruct.SimpleContentConstructor;
import org.pdf4j.saxon.instruct.SimpleNodeConstructor;
import org.pdf4j.saxon.om.Axis;
import org.pdf4j.saxon.om.AxisIterator;
import org.pdf4j.saxon.om.NodeInfo;
import org.pdf4j.saxon.trans.XPathException;
import org.pdf4j.saxon.type.Type;
import org.pdf4j.saxon.value.StringValue;
/**
* Common superclass for XSLT elements whose content template produces a text
* value: xsl:attribute, xsl:comment, and xsl:processing-instruction
*/
public abstract class XSLStringConstructor extends StyleElement {
//protected String stringValue = null;
protected Expression select = null;
/**
* Determine whether this node is an instruction.
*
* @return true - it is an instruction
*/
public boolean isInstruction() {
return true;
}
/**
* Determine whether this type of element is allowed to contain a template-body
*
* @return true: yes, it may contain a template-body
*/
public boolean mayContainSequenceConstructor() {
return true;
}
public void validate() throws XPathException {
if (select != null && hasChildNodes()) {
String errorCode = getErrorCodeForSelectPlusContent();
compileError("An " + getDisplayName() + " element with a select attribute must be empty", errorCode);
}
AxisIterator kids = iterateAxis(Axis.CHILD);
NodeInfo first = (NodeInfo)kids.next();
if (select == null) {
if (first == null) {
// there are no child nodes and no select attribute
//stringValue = "";
select = new StringLiteral(StringValue.EMPTY_STRING);
} else {
if (kids.next() == null) {
// there is exactly one child node
if (first.getNodeKind() == Type.TEXT) {
// it is a text node: optimize for this case
select = new StringLiteral(first.getStringValue());
}
}
}
}
}
/**
* Get the error code to be returned when the element has a select attribute but is not empty.
* @return the error code defined for this condition, for this particular instruction
*/
protected abstract String getErrorCodeForSelectPlusContent();
protected void compileContent(Executable exec, SimpleNodeConstructor inst, Expression separator) throws XPathException {
if (separator == null) {
separator = new StringLiteral(StringValue.SINGLE_SPACE);
}
try {
if (select != null) {
inst.setSelect(
makeExpressionVisitor().simplify(new SimpleContentConstructor(select, separator)),
exec.getConfiguration());
} else {
Expression content = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
inst.setSelect(
makeExpressionVisitor().simplify(new SimpleContentConstructor(content, separator)),
exec.getConfiguration());
}
} catch (XPathException err) {
compileError(err);
}
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//