io.macgyver.core.resource.ResourceProvider.java Source code

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Here is the source code for io.macgyver.core.resource.ResourceProvider.java

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/**
 * 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 io.macgyver.core.resource;

import java.io.IOException;

import com.google.common.base.Optional;
import com.google.common.base.Strings;

import rx.Observable;

public abstract class ResourceProvider {

    String prefix = null;

    public abstract Iterable<Resource> findResources(ResourceMatcher rm) throws IOException;

    public final Iterable<Resource> findResources() throws IOException {
        return findResources(ResourceMatchers.matchAll());
    }

    public Observable<Resource> allResources() throws IOException {
        return Observable.from(findResources());
    }

    public Optional<Resource> findResourceByHash(String hash) throws IOException {
        for (Resource r : findResources()) {
            if (r.getHash().equals(hash)) {
                return Optional.fromNullable(r);
            }
        }
        return Optional.absent();
    }

    public Optional<Resource> findResourceByPath(String path) throws IOException {
        try {
            return Optional.fromNullable(getResourceByPath(path));
        } catch (IOException e) {

        }
        return Optional.absent();
    }

    public abstract Resource getResourceByPath(String path) throws IOException;

    public String removePrefix(String input) {
        if (input == null || prefix == null) {
            return input;
        }
        if (input.startsWith(prefix + "/")) {
            return input.substring(prefix.length() + 1);
        }
        return input;
    }

    public String addPrefix(String input) {
        if (Strings.isNullOrEmpty(prefix)) {
            return input;
        } else {
            return prefix + "/" + input;
        }
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }

    public String getPrefix() {
        return prefix;
    }

    public abstract void refresh() throws IOException;
}