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Android example source code file (CacheLoader.java)

This example Android source code file (CacheLoader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, cacheloader, content, http, internet, net, network, ok, override, streamloader, stringbuilder, text

The CacheLoader.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed 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.
 */

package android.webkit;

import android.net.http.Headers;
import android.text.TextUtils;

/**
 * This class is a concrete implementation of StreamLoader that uses a
 * CacheResult as the source for the stream. The CacheResult stored mimetype
 * and encoding is added to the HTTP response headers.
 */
class CacheLoader extends StreamLoader {

    CacheManager.CacheResult mCacheResult;  // Content source

    /**
     * Constructs a CacheLoader for use when loading content from the cache.
     *
     * @param loadListener LoadListener to pass the content to
     * @param result CacheResult used as the source for the content.
     */
    CacheLoader(LoadListener loadListener, CacheManager.CacheResult result) {
        super(loadListener);
        mCacheResult = result;
    }

    @Override
    protected boolean setupStreamAndSendStatus() {
        mDataStream = mCacheResult.inStream;
        mContentLength = mCacheResult.contentLength;
        mLoadListener.status(1, 1, mCacheResult.httpStatusCode, "OK");
        return true;
    }

    @Override
    protected void buildHeaders(Headers headers) {
        StringBuilder sb = new StringBuilder(mCacheResult.mimeType);
        if (!TextUtils.isEmpty(mCacheResult.encoding)) {
            sb.append(';');
            sb.append(mCacheResult.encoding);
        }
        headers.setContentType(sb.toString());

        if (!TextUtils.isEmpty(mCacheResult.location)) {
            headers.setLocation(mCacheResult.location);
        }

        if (!TextUtils.isEmpty(mCacheResult.expiresString)) {
            headers.setExpires(mCacheResult.expiresString);
        }

        if (!TextUtils.isEmpty(mCacheResult.contentdisposition)) {
            headers.setContentDisposition(mCacheResult.contentdisposition);
        }

        if (!TextUtils.isEmpty(mCacheResult.crossDomain)) {
            headers.setXPermittedCrossDomainPolicies(mCacheResult.crossDomain);
        }
    }
}

Other Android examples (source code examples)

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