org.apache.abdera2.examples.uritemplates.URITemplates.java Source code

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Here is the source code for org.apache.abdera2.examples.uritemplates.URITemplates.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  The ASF licenses this file to You
 * 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.  For additional information regarding
 * copyright in this work, please see the NOTICE file in the top level
 * directory of this distribution.
 */
package org.apache.abdera2.examples.uritemplates;

import java.util.Iterator;
import java.util.List;

import org.apache.abdera2.common.templates.CachingContext;
import org.apache.abdera2.common.templates.MapContext;
import org.apache.abdera2.common.templates.Template;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterators;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;

@SuppressWarnings("unchecked")
public final class URITemplates {

    private static final Template template = new Template("http://example.org/~{user}{/categories}{?foo,bar}");

    public static void main(String... args) throws Exception {

        exampleWithObject();
        exampleIRIWithObject();
        exampleWithMap();
        exampleWithHashMapContext();
        exampleWithCustomContext();

    }

    // Using a Java object
    private static void exampleWithObject() {
        System.out.println(template.expand(new MyObject()));
    }

    // Using a Java object
    private static void exampleIRIWithObject() {
        System.out.println(template.expand(new MyObject(), true));
    }

    // Using a Map
    private static void exampleWithMap() {
        Multimap<String, Object> map = LinkedHashMultimap.create();
        map.put("user", "james");
        map.put("categories", "a");
        map.put("categories", "b");
        map.put("categories", "c");
        map.put("foo", "abc");
        map.put("bar", "xyz");
        System.out.println(template.expand(map));
    }

    // Using a HashMap based context
    private static void exampleWithHashMapContext() {
        MapContext context = new MapContext();
        context.put("user", "james");
        context.put("categories", new String[] { "a", "b", "c" });
        context.put("foo", "abc");
        context.put("bar", "xyz");
        System.out.println(template.expand(context));
    }

    // Using a custom context implementation
    private static void exampleWithCustomContext() {
        CachingContext context = new CachingContext(false) {
            private static final long serialVersionUID = 4896250661828139020L;

            protected <T> T resolveActual(String var) {
                if (var.equals("user"))
                    return (T) "james";
                else if (var.equals("categories"))
                    return (T) new String[] { "a", "b", "c" };
                else if (var.equals("foo"))
                    return (T) "abc";
                else if (var.equals("bar"))
                    return (T) "xyz";
                else
                    return null;
            }

            public Iterator<String> iterator() {
                return Iterators.forArray("user", "categories", "foo", "bar");
            }

            public boolean contains(String var) {
                return resolveActual(var) != null;
            }
        };
        System.out.println(template.expand(context));
    }

    public static class MyObject {
        public String user = "james";

        public List<String> getCategories() {
            return ImmutableList.of("a", "b", "c");
        }

        public Foo[] getFoo() {
            return new Foo[] { new Foo(), new Foo() };
        }

        public String getBar() {
            return "xyz";
        }
    }

    private static class Foo {
        public String toString() {
            return "abc";
        }
    }
}