com.google.gwt.core.ext.arguments.JArguments.java Source code

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Here is the source code for com.google.gwt.core.ext.arguments.JArguments.java

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/*
 * Copyright 2013 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.gwt.core.ext.arguments;

/**
 * Provides unique keys for a argument lists.
 */
public class JArguments {

    private static void appendKey(StringBuilder sb, JArgument argument) {
        if (argument instanceof JBooleanArgument) {
            JBooleanArgument cast = (JBooleanArgument) argument;
            sb.append('B');
            sb.append(cast.getValue() ? 1 : 0);
        } else if (argument instanceof JCharArgument) {
            JCharArgument cast = (JCharArgument) argument;
            sb.append('H');
            sb.append(Integer.toHexString(cast.getValue()));
        } else if (argument instanceof JClassArgument) {
            JClassArgument cast = (JClassArgument) argument;
            sb.append('C');
            sb.append(Integer.toHexString(cast.getValue().hashCode()));
        } else if (argument instanceof JArrayArgument) {
            JArrayArgument cast = (JArrayArgument) argument;
            sb.append('A');
            appendKeys(sb, cast.getElements());
            sb.append('_');
        } else if (argument instanceof JDoubleArgument) {
            JDoubleArgument cast = (JDoubleArgument) argument;
            sb.append('D');
            sb.append(Long.toHexString(Double.doubleToRawLongBits(cast.getValue())));
        } else if (argument instanceof JEnumArgument) {
            JEnumArgument.Value cast = ((JEnumArgument) argument).getValue();
            sb.append('E');
            sb.append(Integer.toHexString(cast.getEnumClassName().hashCode()));
            sb.append('o');
            sb.append(Integer.toHexString(cast.getEnumOrdinal()));
        } else if (argument instanceof JFloatArgument) {
            JFloatArgument cast = (JFloatArgument) argument;
            sb.append('F');
            sb.append(Integer.toHexString(Float.floatToRawIntBits(cast.getValue())));
        } else if (argument instanceof JIntArgument) {
            JIntArgument cast = (JIntArgument) argument;
            sb.append('I');
            sb.append(Integer.toHexString(cast.getValue()));
        } else if (argument instanceof JLongArgument) {
            JLongArgument cast = (JLongArgument) argument;
            sb.append('L');
            sb.append(Long.toHexString(cast.getValue()));
        } else if (argument instanceof JNullArgument) {
            sb.append('N');
        } else if (argument instanceof JStringArgument) {
            JStringArgument cast = (JStringArgument) argument;
            sb.append('S');
            sb.append(Integer.toHexString(cast.getValue().hashCode()));
        } else if (argument instanceof JOpaqueArgument) {
            sb.append('O');
        }
    }

    private static void appendKeys(StringBuilder sb, JArgument[] arguments) {
        for (JArgument a : arguments) {
            appendKey(sb, a);
        }
    }

    /**
     * Calculates a unique key for the list of arguments.
     * 
     * @param arguments list of arguments.
     * @return a unique key.
     */
    public static String getKey(JArgument... arguments) {
        StringBuilder sb = new StringBuilder();
        appendKeys(sb, arguments);
        return sb.toString();
    }

    private JArguments() {
    }
}