org.xchain.framework.jxpath.StandardFunctions.java Source code

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Here is the source code for org.xchain.framework.jxpath.StandardFunctions.java

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/**
 *    Copyright 2011 meltmedia
 *
 *    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.xchain.framework.jxpath;

import org.apache.commons.jxpath.Function;
import org.apache.commons.jxpath.Functions;
import org.apache.commons.jxpath.PackageFunctions;
import org.apache.commons.jxpath.functions.MethodFunction;
import org.apache.commons.jxpath.util.MethodLookupUtils;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Set;
import java.lang.reflect.Method;

/**
 * @author Christian Trimble
 */
public class StandardFunctions implements Functions {
    private String namespace;
    private PackageFunctions packageFunctions = new PackageFunctions("", null);

    public StandardFunctions(String namespace) {
        this.namespace = namespace;
    }

    public Set<String> getUsedNamespaces() {
        return Collections.singleton(namespace);
    }

    public Function getFunction(String namespace, String name, Object[] parameters) {
        if ((this.namespace == null && namespace != null)
                || (this.namespace != null && !this.namespace.equals(namespace))) {
            return null;
        }

        if (parameters == null) {
            parameters = new Object[] {};
        }

        if ("string-join".equals(name)) {
            Method method = MethodLookupUtils.lookupStaticMethod(StandardFunctions.class, "stringJoin", parameters);

            if (method == null) {
                return packageFunctions.getFunction(namespace, name, parameters);
            }

            return new MethodFunction(method);
        }

        return packageFunctions.getFunction(namespace, name, parameters);
    }

    public static String stringJoin(Collection<Object> collection, String seperator) {
        StringBuilder stringBuilder = new StringBuilder();
        if (collection != null) {
            Iterator<Object> iterator = collection.iterator();
            while (iterator.hasNext()) {
                stringBuilder.append(iterator.next());
                if (iterator.hasNext()) {
                    stringBuilder.append(seperator);
                }
            }
        }
        return stringBuilder.toString();
    }

    public static String stringJoin(Object[] array, String seperator) {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < array.length; i++) {
            stringBuilder.append(array[i]);
            if (i < array.length + 1) {
                stringBuilder.append(seperator);
            }
        }
        return stringBuilder.toString();
    }
}