com.evolveum.midpoint.model.common.expression.script.xpath.ReflectionXPathFunctionResolver.java Source code

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Here is the source code for com.evolveum.midpoint.model.common.expression.script.xpath.ReflectionXPathFunctionResolver.java

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/*
 * Copyright (c) 2010-2013 Evolveum
 *
 * 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 com.evolveum.midpoint.model.common.expression.script.xpath;

import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import javax.xml.namespace.QName;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionException;
import javax.xml.xpath.XPathFunctionResolver;

import com.evolveum.midpoint.model.common.expression.functions.BasicExpressionFunctions;
import com.evolveum.midpoint.model.common.expression.functions.FunctionLibrary;
import com.evolveum.midpoint.schema.constants.MidPointConstants;
import com.evolveum.midpoint.util.MiscUtil;
import com.evolveum.midpoint.util.logging.Trace;
import com.evolveum.midpoint.util.logging.TraceManager;
import org.apache.commons.lang.StringUtils;

/**
 * @author semancik
 *
 */
public class ReflectionXPathFunctionResolver implements XPathFunctionResolver {

    private static final Object LOG_FUNCTION_NAME = "logDebug";

    public static final Trace LOGGER = TraceManager.getTrace(ReflectionXPathFunctionResolver.class);

    private Collection<FunctionLibrary> functions;

    public ReflectionXPathFunctionResolver(Collection<FunctionLibrary> functions) {
        super();
        this.functions = functions;
    }

    /* (non-Javadoc)
     * @see javax.xml.xpath.XPathFunctionResolver#resolveFunction(javax.xml.namespace.QName, int)
     */
    @Override
    public XPathFunction resolveFunction(QName functionQName, int arity) {
        boolean enableDebug = false;
        String namespace = functionQName.getNamespaceURI();
        if (StringUtils.isEmpty(namespace)) {
            namespace = MidPointConstants.NS_FUNC_BASIC;
            enableDebug = true;
        } else if (namespace.equals(MidPointConstants.NS_FUNC_BASIC)) {
            enableDebug = true;
        }

        FunctionLibrary lib = findLibrary(namespace);
        if (lib == null) {
            LOGGER.trace("Unknown namespace for function {} function with {} arguments", functionQName, arity);
            return null;
        }

        Object functionObject = null;
        if (lib.getXmlFunctions() != null) {
            functionObject = lib.getXmlFunctions();
        } else {
            functionObject = lib.getGenericFunctions();
        }

        String functionName = functionQName.getLocalPart();

        LOGGER.trace("Resolving to {} function with {} arguments", functionName, arity);
        ReflectionXPathFunctionWrapper xPathFunction = new ReflectionXPathFunctionWrapper(functionObject,
                functionName, arity, enableDebug);
        return xPathFunction;
    }

    private FunctionLibrary findLibrary(String namespace) {
        for (FunctionLibrary lib : functions) {
            if (lib.getNamespace().equals(namespace)) {
                return lib;
            }
        }
        return null;
    }

}