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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.javafx.binding;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import javafx.beans.binding.StringBinding;
import javafx.beans.binding.StringExpression;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;

import com.sun.javafx.collections.annotations.ReturnsUnmodifiableCollection;

public abstract class StringFormatter extends StringBinding {

    private static Object extractValue(Object obj) {
        return obj instanceof ObservableValue ? ((ObservableValue)obj).getValue() : obj;
    }

    private static Object[] extractValues(Object[] objs) {
        final int n = objs.length;
        final Object[] values = new Object[n];
        for (int i = 0; i < n; i++) {
            values[i] = extractValue(objs[i]);
        }
        return values;
    }

    private static ObservableValue[] extractDependencies(Object... args) {
        final List> dependencies = new ArrayList>();
        for (final Object obj : args) {
            if (obj instanceof ObservableValue) {
                dependencies.add((ObservableValue) obj);
            }
        }
        return dependencies.toArray(new ObservableValue[dependencies.size()]);
    }

    public static StringExpression convert(final ObservableValue observableValue) {
        if (observableValue == null) {
            throw new NullPointerException("ObservableValue must be specified");
        }
        if (observableValue instanceof StringExpression) {
            return (StringExpression) observableValue;
        } else {
            return new StringBinding() {
                {
                    super.bind(observableValue);
                }

                @Override
                public void dispose() {
                    super.unbind(observableValue);
                }

                @Override
                protected String computeValue() {
                    final Object value = observableValue.getValue();
                    return (value == null)? "null" : value.toString();
                }

                @Override
                @ReturnsUnmodifiableCollection
                public ObservableList> getDependencies() {
                    return FXCollections.> singletonObservableList(observableValue);
                }
            };
        }
    }

    public static StringExpression concat(final Object... args) {
        if ((args == null) || (args.length == 0)) {
            return StringConstant.valueOf("");
        }
        if (args.length == 1) {
            final Object cur = args[0];
            return cur instanceof ObservableValue ? convert((ObservableValue) cur)
                    : StringConstant.valueOf(cur.toString());
        }
        if (extractDependencies(args).length == 0) {
            final StringBuilder builder = new StringBuilder();
            for (final Object obj : args) {
                builder.append(obj);
            }
            return StringConstant.valueOf(builder.toString());
        }
        return new StringFormatter() {
            {
                super.bind(extractDependencies(args));
            }

            @Override
            public void dispose() {
                super.unbind(extractDependencies(args));
            }

            @Override
            protected String computeValue() {
                final StringBuilder builder = new StringBuilder();
                for (final Object obj : args) {
                    builder.append(extractValue(obj));
                }
                return builder.toString();
            }

            @Override
            @ReturnsUnmodifiableCollection
            public ObservableList> getDependencies() {
                return FXCollections.unmodifiableObservableList(FXCollections
                        .observableArrayList(extractDependencies(args)));
            }
        };
    }

    public static StringExpression format(final Locale locale, final String format, final Object... args) {
        if (format == null) {
            throw new NullPointerException("Format cannot be null.");
        }
        if (extractDependencies(args).length == 0) {
            return StringConstant.valueOf(String.format(locale, format, args));
        }
        final StringFormatter formatter = new StringFormatter() {
            {
                super.bind(extractDependencies(args));
            }

            @Override
            public void dispose() {
                super.unbind(extractDependencies(args));
            }

            @Override
            protected String computeValue() {
                final Object[] values = extractValues(args);
                return String.format(locale, format, values);
            }

            @Override
            @ReturnsUnmodifiableCollection
            public ObservableList> getDependencies() {
                return FXCollections.unmodifiableObservableList(FXCollections
                        .observableArrayList(extractDependencies(args)));
            }
        };
        // Force calculation to check format
        formatter.get();
        return formatter;
    }

    public static StringExpression format(final String format, final Object... args) {
        if (format == null) {
            throw new NullPointerException("Format cannot be null.");
        }
        if (extractDependencies(args).length == 0) {
            return StringConstant.valueOf(String.format(format, args));
        }
        final StringFormatter formatter = new StringFormatter() {
            {
                super.bind(extractDependencies(args));
            }

            @Override
            public void dispose() {
                super.unbind(extractDependencies(args));
            }

            @Override
            protected String computeValue() {
                final Object[] values = extractValues(args);
                return String.format(format, values);
            }

            @Override
            @ReturnsUnmodifiableCollection
            public ObservableList> getDependencies() {
                return FXCollections.unmodifiableObservableList(FXCollections
                        .observableArrayList(extractDependencies(args)));
            }
        };
        // Force calculation to check format
        formatter.get();
        return formatter;
    }
}