com.google.template.soy.javasrc.dyncompile.InMemoryJavaFileObject.java Source code

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Here is the source code for com.google.template.soy.javasrc.dyncompile.InMemoryJavaFileObject.java

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/*
 * Copyright 2010 Google Inc.
 *
 * 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.template.soy.javasrc.dyncompile;

import com.google.common.base.Throwables;
import com.google.common.io.CharStreams;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

import javax.lang.model.element.Modifier;
import javax.lang.model.element.NestingKind;
import javax.tools.JavaFileObject;

/**
 * A java file object whose content is stored in-memory.
 *
 * @author Mike Samuel
 */
abstract class InMemoryJavaFileObject implements JavaFileObject {

    /** A modified date to use for fake files to avoid using 0 which might trigger corner cases. */
    static final long IN_THE_YEAR_2000_MILLIS = 31557600000L;

    /** A file path. */
    private final String path;

    InMemoryJavaFileObject(String path) {
        this.path = path;
    }

    /** A path used for this in-memory file. */
    public String getPath() {
        return path;
    }

    @Override
    public URI toUri() {
        // We make up our own protocol.
        // The JavaCompiler gets handles to files using JavaFileManager.listFiles
        // and doesn't try to resolve these URIs.
        try {
            return new URI("memory", null, null, 0, path, null, null);
        } catch (URISyntaxException ex) {
            Throwables.propagate(ex);
            return null;
        }
    }

    @Override
    public String getName() {
        return path.substring(path.lastIndexOf('/') + 1);
    }

    @Override
    public long getLastModified() {
        return IN_THE_YEAR_2000_MILLIS;
    }

    @Override
    public boolean delete() {
        // Deletion of in-memory files always fails.
        return false;
    }

    @Override
    public boolean isNameCompatible(String simpleName, Kind kind) {
        if (kind != getKind()) {
            return false;
        }
        String name = getName();
        int dotIndex = name.indexOf('.');
        String nameWithoutExtension = dotIndex >= 0 ? name.substring(0, dotIndex) : name;
        // No need to normalize names and identifiers since this is all in-memory.
        return kind == getKind() && simpleName.equals(nameWithoutExtension);
    }

    @Override
    public NestingKind getNestingKind() {
        return null; // This is asking for a hint.  Null means don't know.
    }

    @Override
    public Modifier getAccessLevel() {
        return null; // This is asking for a hint.  Null means don't know.
    }

    @Override
    public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
        return CharStreams.toString(openReader(ignoreEncodingErrors));
    }

    @Override
    public String toString() {
        return path; // For ease of debugging.
    }

}