multivaluedmapimpl.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 188 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.jersey.impl;

import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import javax.ws.rs.core.MultivaluedMap;

/**
 *
 * @author [e-mail]
 */
public class MultivaluedMapImpl 
        extends HashMap<String, List<String>> 
        implements MultivaluedMap<String, String> {
    
    static final long serialVersionUID = -6052320403766368902L;
    
    // MultivaluedMap
    
    public final void putSingle(String key, String value) {
        List<String> l = getList(key);
                
        l.clear();
        if (value != null)
            l.add(value);
        else 
            l.add("");
    }
    
    public final void add(String key, String value) {
        List<String> l = getList(key);
        
        if (value != null)
            l.add(value);
        else 
            l.add("");
    }
    
    public final String getFirst(String key) {
        List<String> values = get(key);
        if (values != null && values.size() > 0)
            return values.get(0);
        else
            return null;
    }
    
    // 
    
    public final void addFirst(String key, String value) {
        List<String> l = getList(key);
        
        if (value != null)
            l.add(0, value);
        else 
            l.add(0, "");
    }
    
    public final <A> List<A> get(String key, Class<A> type) {
        Constructor<A> c = null;
        try {
            c = type.getConstructor(String.class);
        } catch (Exception ex) {
            throw new IllegalArgumentException(type.getName()+" has no String constructor", ex);
        }
        
        ArrayList<A> l = null;
        List<String> values = get(key);
        if (values != null) {
            l = new ArrayList<A>();
            for (String value: values) {
                try {
                    l.add(c.newInstance(value));
                } catch (Exception ex) {
                    l.add(null);
                }
            }
        }
        return l;
    }

    public final void putSingle(String key, Object value) {
        List<String> l = getList(key);
                
        l.clear();
        if (value != null)
            l.add(value.toString());
        else 
            l.add("");
    }
    
    public final void add(String key, Object value) {
        List<String> l = getList(key);
        
        if (value != null)
            l.add(value.toString());
        else 
            l.add("");
    }

    private final List<String> getList(String key) {
        List<String> l = get(key);
        if (l == null) {
            l = new LinkedList<String>();
            put(key, l);
        }
        return l;
    }
    
    public final <A> A getFirst(String key, Class<A> type) {
        String value = getFirst(key);
        if (value == null)
            return null;
        Constructor<A> c = null;
        try {
            c = type.getConstructor(String.class);
        } catch (Exception ex) {
            throw new IllegalArgumentException(type.getName()+" has no String constructor", ex);
        }
        A retVal = null;
        try {
            retVal = c.newInstance(value);
        } catch (Exception ex) {
        }
        return retVal;
    }
    
    @SuppressWarnings("unchecked")
    public final <A> A getFirst(String key, A defaultValue) {
        String value = getFirst(key);
        if (value == null)
            return defaultValue;
        
        Class<A> type = (Class<A>)defaultValue.getClass();
        
        Constructor<A> c = null;
        try {
            c = type.getConstructor(String.class);
        } catch (Exception ex) {
            throw new IllegalArgumentException(type.getName()+" has no String constructor", ex);
        }
        A retVal = defaultValue;
        try {
            retVal = c.newInstance(value);
        } catch (Exception ex) {
        }
        return retVal;
    }
}