com.appslandia.plum.base.RequestWrapper Maven / Gradle / Ivy

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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.base;

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpSession;

import com.appslandia.common.utils.ArrayUtils;
import com.appslandia.common.utils.AssertUtils;
import com.appslandia.plum.utils.ServletUtils;

/**
 *
 * @author Loc Ha
 *
 */
public class RequestWrapper extends HttpServletRequestWrapper {

	final Map mergedParamMap;

	public RequestWrapper(HttpServletRequest request, Map pathParamMap) {
		super(request);
		this.mergedParamMap = !pathParamMap.isEmpty() ? this.mergeParameters(pathParamMap) : null;
	}

	@Override
	public HttpSession getSession() {
		return getSession(true);
	}

	@Override
	public HttpSession getSession(boolean create) {
		AppConfig config = ServletUtils.getAppScoped(this, AppConfig.class);
		AssertUtils.assertState(config.isEnableSession(), "Http session is disabled.");

		return super.getSession(create);
	}

	@Override
	public String getParameter(String name) {
		if (this.mergedParamMap == null) {
			return super.getParameter(name);
		}
		String[] values = this.mergedParamMap.get(name);
		return (values != null) ? values[0] : null;
	}

	@Override
	public String[] getParameterValues(String name) {
		if (this.mergedParamMap == null) {
			return super.getParameterValues(name);
		}
		String[] values = this.mergedParamMap.get(name);
		return (values != null) ? ArrayUtils.copy(values) : null;
	}

	@Override
	public Map getParameterMap() {
		if (this.mergedParamMap == null) {
			return super.getParameterMap();
		}
		return this.mergedParamMap;
	}

	@Override
	public Enumeration getParameterNames() {
		if (this.mergedParamMap == null) {
			return super.getParameterNames();
		}
		return Collections.enumeration(this.mergedParamMap.keySet());
	}

	protected Map mergeParameters(Map pathParamMap) {
		final Map merged = new HashMap<>();

		for (Entry param : pathParamMap.entrySet()) {
			merged.put(param.getKey(), new String[] { param.getValue() });
		}

		for (Entry param : this.getRequest().getParameterMap().entrySet()) {
			String[] values = merged.get(param.getKey());
			if (values == null) {
				merged.put(param.getKey(), param.getValue());
			} else {
				merged.put(param.getKey(), ArrayUtils.append(values, param.getValue()));
			}
		}
		return Collections.unmodifiableMap(merged);
	}
}