com.google.enterprise.adaptor.fs.MultiRootMockFileDelegate.java Source code

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Here is the source code for com.google.enterprise.adaptor.fs.MultiRootMockFileDelegate.java

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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 com.google.enterprise.adaptor.fs;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

import java.io.FileNotFoundException;
import java.nio.file.Path;
import java.util.Map;

class MultiRootMockFileDelegate extends MockFileDelegate {

    @VisibleForTesting
    final MockFile[] roots;

    private final Map<MockFile, MockFileDelegate> delegates;

    MultiRootMockFileDelegate(MockFile... roots) {
        Preconditions.checkArgument(roots.length > 0, "At least one root must be specified.");
        this.roots = roots;
        ImmutableMap.Builder<MockFile, MockFileDelegate> builder = ImmutableMap.builder();
        for (MockFile root : roots) {
            builder.put(root, new MockFileDelegate(root));
        }
        this.delegates = builder.build();
    }

    /**
     * Returns the {@link MockFile} identified by the supplied {@link Path}.
     * @throws FileNotFoundException if the file is not found.
     */
    @Override
    MockFile getFile(Path doc) throws FileNotFoundException {
        for (MockFileDelegate delegate : delegates.values()) {
            try {
                return delegate.getFile(doc);
            } catch (FileNotFoundException e) {
                // Try the next delegate.
            }
        }
        throw new FileNotFoundException("not found: " + doc.toString());
    }

    /**
     * Returns the {@link MockFile} identified by the supplied {@link Path}.
     */
    @Override
    MockFile getFileOrRoot(Path doc) {
        try {
            return getFile(doc);
        } catch (FileNotFoundException e) {
            throw new AssertionError("Not found, but should have been: " + doc);
        }
    }
}