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Jersey example for implementing generic PATCH support via JAX-RS reader interceptor. Taken from Gerard Davison's blog entry: http://kingsfleet.blogspot.co.uk/2014/02/transparent-patch-support-in-jax-rs-20.html

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014-2015 Oracle and/or its affiliates. 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
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
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 * 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
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 */
package org.glassfish.jersey.examples.httppatch;

import java.util.ArrayList;
import java.util.List;

/**
 * A resource state modelled as Java bean (that can be patched).
 *
 * @author Gerard Davison (gerard.davison at oracle.com)
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public class State {

    private String title;
    private String message;
    private List list;

    /**
     * Create new bean instance without any data.
     */
    public State() {
        this.title = "";
        this.message = "";
        this.list = new ArrayList();
    }

    public void setList(List list) {
        this.list = list;
    }

    public List getList() {
        return list;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getMessage() {
        return message;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        State bean = (State) o;

        if (list != null ? !list.equals(bean.list) : bean.list != null) {
            return false;
        }
        if (message != null ? !message.equals(bean.message) : bean.message != null) {
            return false;
        }
        if (title != null ? !title.equals(bean.title) : bean.title != null) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int result = title != null ? title.hashCode() : 0;
        result = 31 * result + (message != null ? message.hashCode() : 0);
        result = 31 * result + (list != null ? list.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return "State{"
                + "title='" + title + '\''
                + ", message='" + message + '\''
                + ", list=" + list
                + '}';
    }
}