chrismair | 00dc7bd | 2014-05-11 21:21:28 +0000 | [diff] [blame] | 1 | /*
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| 2 | * Copyright 20078 the original author or authors.
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | */
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| 16 | package org.mockftpserver.core.command;
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| 17 |
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| 18 | import org.mockftpserver.core.CommandSyntaxException;
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| 19 | import org.mockftpserver.core.util.Assert;
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| 20 |
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| 21 | import java.util.Arrays;
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| 22 | import java.util.List;
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| 23 |
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| 24 | /**
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| 25 | * Represents a command received from an FTP client, containing a command name and parameters.
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| 26 | * Objects of this class are immutable.
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| 27 | *
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| 28 | * @author Chris Mair
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| 29 | * @version $Revision$ - $Date$
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| 30 | */
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| 31 | public final class Command {
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| 32 |
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| 33 | private String name;
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| 34 | private String[] parameters;
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| 35 |
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| 36 | /**
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| 37 | * Construct a new immutable instance with the specified command name and parameters
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| 38 | *
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| 39 | * @param name - the command name; may not be null
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| 40 | * @param parameters - the command parameters; may be empty; may not be null
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| 41 | */
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| 42 | public Command(String name, String[] parameters) {
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| 43 | Assert.notNull(name, "name");
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| 44 | Assert.notNull(parameters, "parameters");
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| 45 | this.name = name;
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| 46 | this.parameters = copy(parameters);
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| 47 | }
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| 48 |
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| 49 | /**
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| 50 | * Construct a new immutable instance with the specified command name and parameters
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| 51 | *
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| 52 | * @param name - the command name; may not be null
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| 53 | * @param parameters - the command parameters; may be empty; may not be null
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| 54 | */
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| 55 | public Command(String name, List parameters) {
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| 56 | this(name, (String[]) parameters.toArray(new String[parameters.size()]));
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| 57 | }
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| 58 |
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| 59 | /**
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| 60 | * @return the name
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| 61 | */
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| 62 | public String getName() {
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| 63 | return name;
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| 64 | }
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| 65 |
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| 66 | /**
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| 67 | * @return the parameters
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| 68 | */
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| 69 | public String[] getParameters() {
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| 70 | return copy(parameters);
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| 71 | }
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| 72 |
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| 73 | /**
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| 74 | * Get the String value of the parameter at the specified index
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| 75 | *
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| 76 | * @param index - the index
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| 77 | * @return the parameter value as a String
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| 78 | * @throws org.mockftpserver.core.util.AssertFailedException
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| 79 | * if the parameter index is invalid or the value is not a valid String
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| 80 | */
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| 81 | public String getRequiredParameter(int index) {
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| 82 | assertValidIndex(index);
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| 83 | return parameters[index];
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| 84 | }
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| 85 |
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| 86 | /**
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| 87 | * Get the String value of the parameter at the specified index; return null if no parameter exists for the index
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| 88 | *
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| 89 | * @param index - the index
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| 90 | * @return the parameter value as a String, or null if this Command does not have a parameter for that index
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| 91 | */
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| 92 | public String getParameter(int index) {
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| 93 | return (parameters.length > index) ? parameters[index] : null;
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| 94 | }
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| 95 |
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| 96 | /**
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| 97 | * Get the String value of the parameter at the specified index; return null if no
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| 98 | * parameter exists for the index. This is an alias for {@link #getParameter(int)}.
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| 99 | *
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| 100 | * @param index - the index
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| 101 | * @return the parameter value as a String, or null if this Command does not have a parameter for that index
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| 102 | */
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| 103 | public String getOptionalString(int index) {
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| 104 | return getParameter(index);
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| 105 | }
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| 106 |
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| 107 | /**
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| 108 | * @see java.lang.Object#equals(java.lang.Object)
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| 109 | */
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| 110 | public boolean equals(Object obj) {
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| 111 | if (this == obj) {
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| 112 | return true;
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| 113 | }
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| 114 | if (obj == null || !(obj instanceof Command)) {
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| 115 | return false;
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| 116 | }
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| 117 | return this.hashCode() == obj.hashCode();
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| 118 | }
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| 119 |
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| 120 | /**
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| 121 | * @see java.lang.Object#hashCode()
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| 122 | */
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| 123 | public int hashCode() {
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| 124 | String str = name + Arrays.asList(parameters);
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| 125 | return str.hashCode();
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| 126 | }
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| 127 |
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| 128 | /**
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| 129 | * Return the String representation of this object
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| 130 | *
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| 131 | * @see java.lang.Object#toString()
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| 132 | */
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| 133 | public String toString() {
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| 134 | return "Command[" + name + ":" + Arrays.asList(parameters) + "]";
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| 135 | }
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| 136 |
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| 137 | /**
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| 138 | * Return the name, normalized to a common format - convert to upper case.
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| 139 | *
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| 140 | * @return the name converted to upper case
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| 141 | */
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| 142 | public static String normalizeName(String name) {
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| 143 | return name.toUpperCase();
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| 144 | }
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| 145 |
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| 146 | /**
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| 147 | * Construct a shallow copy of the specified array
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| 148 | *
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| 149 | * @param array - the array to copy
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| 150 | * @return a new array with the same contents
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| 151 | */
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| 152 | private static String[] copy(String[] array) {
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| 153 | String[] newArray = new String[array.length];
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| 154 | System.arraycopy(array, 0, newArray, 0, array.length);
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| 155 | return newArray;
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| 156 | }
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| 157 |
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| 158 | /**
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| 159 | * Assert that the index is valid
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| 160 | *
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| 161 | * @param index - the index
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| 162 | * @throws org.mockftpserver.core.CommandSyntaxException
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| 163 | * - if the parameter index is invalid
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| 164 | */
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| 165 | private void assertValidIndex(int index) {
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| 166 | if (index < 0 || index >= parameters.length) {
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| 167 | throw new CommandSyntaxException("The parameter index " + index + " is not valid for " + this);
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| 168 | }
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| 169 | }
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| 170 |
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| 171 | }
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