net.sf.jasperreports.export.CompositeExporterConfigurationFactory.java Source code

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Here is the source code for net.sf.jasperreports.export.CompositeExporterConfigurationFactory.java

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/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2014 TIBCO Software Inc. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.jasperreports.export;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.List;

import net.sf.jasperreports.engine.JRPropertiesUtil;
import net.sf.jasperreports.engine.JasperReportsContext;

import org.apache.commons.lang.ClassUtils;

/**
 * @author Teodor Danciu (teodord@users.sourceforge.net)
 * @version $Id: CompositeExporterConfigurationFactory.java 7197 2014-08-27 11:59:50Z teodord $
 */
public class CompositeExporterConfigurationFactory<C extends CommonExportConfiguration> {
    /**
     * 
     */
    private final JRPropertiesUtil propertiesUtil;
    private final Class<C> configurationInterface;

    /**
     * 
     */
    public CompositeExporterConfigurationFactory(JasperReportsContext jasperReportsContext,
            Class<C> configurationInterface) {
        this.propertiesUtil = JRPropertiesUtil.getInstance(jasperReportsContext);
        this.configurationInterface = configurationInterface;
    }

    /**
     * 
     */
    public C getConfiguration(final C parent, final C child) {
        if (parent == null) {
            return child;
        } else {
            boolean isOverrideHints = parent.isOverrideHints() == null
                    ? propertiesUtil.getBooleanProperty(
                            ExporterConfiguration.PROPERTY_EXPORT_CONFIGURATION_OVERRIDE_REPORT_HINTS)
                    : parent.isOverrideHints().booleanValue();
            return getConfiguration(parent, child, isOverrideHints);
        }
    }

    /**
     * 
     */
    public C getConfiguration(final C parent, final C child, boolean isOverrideHints) {
        if (parent == null) {
            return child;
        } else {
            if (isOverrideHints) {
                return getProxy(configurationInterface, new DelegateInvocationHandler(child, parent));
            } else {
                return getProxy(configurationInterface, new DelegateInvocationHandler(parent, child));
            }
        }
    }

    /**
     * 
     */
    private final C getProxy(Class<?> clazz, InvocationHandler handler) {
        List<Class<?>> allInterfaces = new ArrayList<Class<?>>();

        if (clazz.isInterface()) {
            allInterfaces.add(clazz);
        } else {
            @SuppressWarnings("unchecked")
            List<Class<?>> lcInterfaces = ClassUtils.getAllInterfaces(clazz);
            allInterfaces.addAll(lcInterfaces);
        }

        @SuppressWarnings("unchecked")
        C composite = (C) Proxy.newProxyInstance(ExporterConfiguration.class.getClassLoader(),
                allInterfaces.toArray(new Class<?>[allInterfaces.size()]), handler);

        return composite;
    }

    /**
     * 
     */
    class DelegateInvocationHandler implements InvocationHandler {
        private final C parent;
        private final C child;

        /**
         * 
         */
        public DelegateInvocationHandler(final C parent, final C child) {
            this.parent = parent;
            this.child = child;
        }

        /**
         * 
         */
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
            Object value = child == null ? null : method.invoke(child, args);
            if (value == null) {
                value = parent == null ? null : method.invoke(parent, args);
            }
            return value;
        }
    }
}