org.apache.abdera2.common.templates.MapContext.java Source code

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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.common.templates;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.abdera2.common.misc.MoreFunctions;
import org.apache.abdera2.common.templates.Context;
import org.apache.abdera2.common.templates.MapContext;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Multimap;
import static com.google.common.base.Preconditions.*;

/**
 * Context implementation based on a HashMap
 */
@SuppressWarnings("unchecked")
public class MapContext extends HashMap<String, Object> implements Context {

    private static final long serialVersionUID = 2206000974505975049L;

    private final boolean isiri;

    public static MapContext with(Map<? extends String, ? extends Object> map) {
        MapContext ctx = new MapContext();
        ctx.putAll(map);
        return ctx;
    }

    public static MapContext with(Map<? extends String, ? extends Object> map, boolean isiri) {
        MapContext ctx = new MapContext(isiri);
        ctx.putAll(map);
        return ctx;
    }

    public MapContext() {
        this.isiri = false;
    }

    public MapContext(boolean isiri) {
        this.isiri = isiri;
    }

    public MapContext(Map<String, Object> map) {
        super(map);
        this.isiri = false;
    }

    public MapContext(Map<String, Object> map, boolean isiri) {
        super(map);
        this.isiri = isiri;
    }

    public MapContext(Context context) {
        checkNotNull(context);
        this.isiri = context.isIri();
        for (String name : context)
            put(name, context.resolve(name));
    }

    public <T> T resolve(String var) {
        return (T) get(var);
    }

    public boolean isIri() {
        return isiri;
    }

    public Iterator<String> iterator() {
        return keySet().iterator();
    }

    @Override
    public int hashCode() {
        return MoreFunctions.genHashCode(super.hashCode(), isiri);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!super.equals(obj))
            return false;
        if (getClass() != obj.getClass())
            return false;
        final MapContext other = (MapContext) obj;
        if (isiri != other.isiri)
            return false;
        return true;
    }

    public boolean contains(String var) {
        return containsKey(var);
    }

    public static MapContext fromMultimap(Multimap<String, Object> multimap) {
        MapContext mc = new MapContext();
        mc.putAll(multimap.asMap());
        return mc;
    }

    /**
     * Returns an Immutable version of this MapContext
     */
    public MapContext immutable() {
        return new ImmutableMapContext(this);
    }

    private static final class ImmutableMapContext extends MapContext {
        private static final long serialVersionUID = 7979187415358996598L;

        ImmutableMapContext(MapContext context) {
            super((Map<String, Object>) context);
        }

        public void clear() {
            throw new UnsupportedOperationException();
        }

        public Set<java.util.Map.Entry<String, Object>> entrySet() {
            return ImmutableSet.copyOf(super.entrySet());
        }

        public Set<String> keySet() {
            return ImmutableSet.copyOf(super.keySet());
        }

        public Object put(String arg0, Object arg1) {
            throw new UnsupportedOperationException();
        }

        public void putAll(Map<? extends String, ? extends Object> arg0) {
            throw new UnsupportedOperationException();
        }

        public Object remove(Object arg0) {
            throw new UnsupportedOperationException();
        }

        public Collection<Object> values() {
            return ImmutableList.copyOf(super.values());
        }

    }
}