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The coolest XML library for Java around. Define typesafe views (projections) to xml. Use XPath to read and write XML. Bind XML to Java collections. Requires at least Java6, supports Java8 features and has no further runtime dependencies.

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/**
 *  Copyright 2014 Sven Ewald
 *
 *  Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.xmlbeam.util.intern;

import java.lang.reflect.Method;
import java.util.Locale;

import javax.xml.namespace.QName;
import javax.xml.xpath.XPathVariableResolver;

import org.xmlbeam.types.StringRenderer;
import org.xmlbeam.util.intern.duplex.DuplexExpression;

/**
 *
 */
public class MethodParamVariableResolver implements XPathVariableResolver {

    private final XPathVariableResolver originalResolver;
    private final Object[] args;
    private final Method method;
    private final DuplexExpression expression;
    private final StringRenderer stringRenderer;

    /**
     * @param method
     * @param args
     * @param expression
     * @param stringRenderer
     * @param originalResolver
     */
    public MethodParamVariableResolver(final Method method, final Object[] args, final DuplexExpression expression, final StringRenderer stringRenderer, final XPathVariableResolver originalResolver) {
        this.method = method;
        this.args = args;
        this.originalResolver = originalResolver;
        this.expression = expression;
        this.stringRenderer = stringRenderer;
    }

    @Override
    public Object resolveVariable(final QName variableName) {
        if ((variableName != null) && (variableName.getLocalPart() != null)) {
            final String uppercaseName = variableName.getLocalPart().toUpperCase(Locale.ENGLISH);
            Integer index = ReflectionHelper.getMethodParameterIndexes(method).get(uppercaseName);
            if (index != null) {
                return stringRenderer.render(args[index].getClass(), args[index], expression.getVariableFormatPattern(variableName.getLocalPart()));
            }
            int preprocessorIndex = Preprocessor.getParameterIndex(uppercaseName);
            if (preprocessorIndex >= 0) {
                return stringRenderer.render(args[preprocessorIndex].getClass(), args[preprocessorIndex], expression.getVariableFormatPattern(variableName.getLocalPart()));
            }
        }
        if (originalResolver == null) {
            return null;
        }
        return originalResolver.resolveVariable(variableName);
    }
}