org.jclouds.scriptbuilder.domain.AppendFile.java Source code

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Here is the source code for org.jclouds.scriptbuilder.domain.AppendFile.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.jclouds.scriptbuilder.domain;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static org.jclouds.scriptbuilder.domain.Statements.interpret;

import java.util.Map;
import java.util.Map.Entry;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;

/**
 * Creates a run script
 * 
 * @author Adrian Cole
 */
public class AppendFile implements Statement {
    public static final String DELIMITER = "END_OF_JCLOUDS_FILE";

    public static Builder builder() {
        return new Builder();
    }

    public static class Builder {
        protected String path;
        protected Iterable<String> lines = ImmutableSet.of();
        protected String delimiter = DELIMITER;
        protected boolean expandVariables;

        /**
         * @see AppendFile#getPath()
         */
        public Builder path(String path) {
            this.path = path;
            return this;
        }

        /**
         * @see AppendFile#getLines()
         */
        public Builder lines(Iterable<String> lines) {
            this.lines = ImmutableList.copyOf(lines);
            return this;
        }

        /**
         * @see AppendFile#getDelimiter()
         */
        public Builder delimiter(String delimiter) {
            this.delimiter = delimiter;
            return this;
        }

        /**
         * @see AppendFile#shouldExpandVariables()
         */
        public Builder expandVariables(boolean expandVariables) {
            this.expandVariables = expandVariables;
            return this;
        }

        public AppendFile build() {
            return new AppendFile(path, lines, delimiter, expandVariables);
        }
    }

    protected final String path;
    protected final Iterable<String> lines;
    protected final String delimiter;
    protected final boolean expandVariables;

    protected AppendFile(String path, Iterable<String> lines, String delimiter, boolean expandVariables) {
        this.path = checkNotNull(path, "PATH");
        this.lines = checkNotNull(lines, "lines");
        this.delimiter = checkNotNull(delimiter, "delimiter");
        checkState(Iterables.size(lines) > 0, "you must pass something to execute");
        this.expandVariables = expandVariables;
    }

    public static String escapeVarTokens(String toEscape, OsFamily family) {
        Map<String, String> inputToEscape = Maps.newHashMap();
        for (ShellToken token : ImmutableList.of(ShellToken.VARL, ShellToken.VARR)) {
            if (!token.to(family).equals("")) {
                String tokenS = "{" + token.toString().toLowerCase() + "}";
                inputToEscape.put(tokenS, "{escvar}" + tokenS);
            }
        }
        for (Entry<String, String> entry : inputToEscape.entrySet()) {
            toEscape = toEscape.replace(entry.getKey(), entry.getValue());
        }
        return toEscape;
    }

    @Override
    public Iterable<String> functionDependencies(OsFamily family) {
        return ImmutableList.of();
    }

    @Override
    public String render(OsFamily family) {
        if (family == OsFamily.UNIX) {
            return interpret(hereFile()).render(family);
        } else {
            return interpret(appendToWindowsFile()).render(family);
        }
    }

    protected String appendToWindowsFile() {
        StringBuilder builder = new StringBuilder();
        for (String line : lines) {
            builder.append(appendLineToWindowsFile(line, path));
        }
        return builder.toString();
    }

    protected String hereFile() {
        StringBuilder hereFile = startHereFile();
        for (String line : lines) {
            hereFile.append('\t').append(line).append("\n");
        }
        hereFile.append(delimiter).append("\n");
        return hereFile.toString();
    }

    public StringBuilder startHereFile() {
        StringBuilder hereFile = new StringBuilder().append("cat >> ").append(path);
        if (expandVariables)
            return hereFile.append(" <<-").append(delimiter).append("\n");
        return hereFile.append(" <<-'").append(delimiter).append("'\n");
    }

    protected String appendLineToWindowsFile(String line, String path) {
        String quote = "";
        if (!ShellToken.VQ.to(OsFamily.WINDOWS).equals("")) {
            quote = "'";
        } else {
            line = escapeVarTokens(line, OsFamily.WINDOWS);
        }
        return String.format("echo %s%s%s >>%s{lf}", quote, line, quote, path);
    }

}