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/*
 * Copyright 2010 the original author or authors.
 *
 * 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 org.gradle.process.internal;

import org.gradle.api.Action;
import org.gradle.api.file.FileCollection;
import org.gradle.api.internal.file.FileCollectionFactory;
import org.gradle.internal.file.PathToFileResolver;
import org.gradle.internal.jvm.Jvm;
import org.gradle.process.CommandLineArgumentProvider;
import org.gradle.process.JavaDebugOptions;
import org.gradle.process.JavaForkOptions;

import javax.inject.Inject;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import static org.gradle.process.internal.util.MergeOptionsUtil.containsAll;
import static org.gradle.process.internal.util.MergeOptionsUtil.getHeapSizeMb;
import static org.gradle.process.internal.util.MergeOptionsUtil.normalized;

public class DefaultJavaForkOptions extends DefaultProcessForkOptions implements JavaForkOptionsInternal {
    private final JvmOptions options;
    private List jvmArgumentProviders;

    @Inject
    public DefaultJavaForkOptions(PathToFileResolver resolver, FileCollectionFactory fileCollectionFactory, JavaDebugOptions debugOptions) {
        super(resolver);
        options = new JvmOptions(fileCollectionFactory, debugOptions);
    }

    @Override
    public List getAllJvmArgs() {
        if (hasJvmArgumentProviders(this)) {
            JvmOptions copy = options.createCopy();
            for (CommandLineArgumentProvider jvmArgumentProvider : jvmArgumentProviders) {
                copy.jvmArgs(jvmArgumentProvider.asArguments());
            }
            return copy.getAllJvmArgs();
        } else {
            return options.getAllJvmArgs();
        }
    }

    @Override
    public void setAllJvmArgs(List arguments) {
        options.setAllJvmArgs(arguments);
        if (hasJvmArgumentProviders(this)) {
            jvmArgumentProviders.clear();
        }
    }

    @Override
    public void setAllJvmArgs(Iterable arguments) {
        options.setAllJvmArgs(arguments);
        if (hasJvmArgumentProviders(this)) {
            jvmArgumentProviders.clear();
        }
    }

    @Override
    public List getJvmArgs() {
        return options.getJvmArgs();
    }

    @Override
    public void setJvmArgs(List arguments) {
        options.setJvmArgs(arguments);
    }

    @Override
    public void setJvmArgs(Iterable arguments) {
        options.setJvmArgs(arguments);
    }

    @Override
    public JavaForkOptions jvmArgs(Iterable arguments) {
        options.jvmArgs(arguments);
        return this;
    }

    @Override
    public JavaForkOptions jvmArgs(Object... arguments) {
        jvmArgs(Arrays.asList(arguments));
        return this;
    }

    @Override
    public List getJvmArgumentProviders() {
        if (jvmArgumentProviders == null) {
            jvmArgumentProviders = new ArrayList();
        }
        return jvmArgumentProviders;
    }

    @Override
    public Map getSystemProperties() {
        return options.getMutableSystemProperties();
    }

    @Override
    public void setSystemProperties(Map properties) {
        options.setSystemProperties(properties);
    }

    @Override
    public JavaForkOptions systemProperties(Map properties) {
        options.systemProperties(properties);
        return this;
    }

    @Override
    public JavaForkOptions systemProperty(String name, Object value) {
        options.systemProperty(name, value);
        return this;
    }

    @Override
    public FileCollection getBootstrapClasspath() {
        return options.getBootstrapClasspath();
    }

    @Override
    public void setBootstrapClasspath(FileCollection classpath) {
        options.setBootstrapClasspath(classpath);
    }

    @Override
    public JavaForkOptions bootstrapClasspath(Object... classpath) {
        options.bootstrapClasspath(classpath);
        return this;
    }

    @Override
    public String getMinHeapSize() {
        return options.getMinHeapSize();
    }

    @Override
    public void setMinHeapSize(String heapSize) {
        options.setMinHeapSize(heapSize);
    }

    @Override
    public String getMaxHeapSize() {
        return options.getMaxHeapSize();
    }

    @Override
    public void setMaxHeapSize(String heapSize) {
        options.setMaxHeapSize(heapSize);
    }

    @Override
    public String getDefaultCharacterEncoding() {
        return options.getDefaultCharacterEncoding();
    }

    @Override
    public void setDefaultCharacterEncoding(String defaultCharacterEncoding) {
        options.setDefaultCharacterEncoding(defaultCharacterEncoding);
    }

    @Override
    public boolean getEnableAssertions() {
        return options.getEnableAssertions();
    }

    @Override
    public void setEnableAssertions(boolean enabled) {
        options.setEnableAssertions(enabled);
    }

    @Override
    public boolean getDebug() {
        return options.getDebug();
    }

    @Override
    public void setDebug(boolean enabled) {
        options.setDebug(enabled);
    }

    @Override
    public JavaDebugOptions getDebugOptions() {
        return options.getDebugOptions();
    }

    @Override
    public void debugOptions(Action action) {
        action.execute(options.getDebugOptions());
    }

    @Override
    protected Map getInheritableEnvironment() {
        // Filter out any environment variables that should not be inherited.
        return Jvm.getInheritableEnvironmentVariables(super.getInheritableEnvironment());
    }

    @Override
    public JavaForkOptions copyTo(JavaForkOptions target) {
        super.copyTo(target);
        options.copyTo(target);
        if (jvmArgumentProviders != null) {
            for (CommandLineArgumentProvider jvmArgumentProvider : jvmArgumentProviders) {
                target.jvmArgs(jvmArgumentProvider.asArguments());
            }
        }
        return this;
    }

    @Override
    public boolean isCompatibleWith(JavaForkOptions options) {
        if (hasJvmArgumentProviders(this) || hasJvmArgumentProviders(options)) {
            throw new UnsupportedOperationException("Cannot compare options with jvmArgumentProviders.");
        }
        return getDebug() == options.getDebug()
            && getEnableAssertions() == options.getEnableAssertions()
            && normalized(getExecutable()).equals(normalized(options.getExecutable()))
            && getWorkingDir().equals(options.getWorkingDir())
            && normalized(getDefaultCharacterEncoding()).equals(normalized(options.getDefaultCharacterEncoding()))
            && getHeapSizeMb(getMinHeapSize()) >= getHeapSizeMb(options.getMinHeapSize())
            && getHeapSizeMb(getMaxHeapSize()) >= getHeapSizeMb(options.getMaxHeapSize())
            && normalized(getJvmArgs()).containsAll(normalized(options.getJvmArgs()))
            && containsAll(getSystemProperties(), options.getSystemProperties())
            && containsAll(getEnvironment(), options.getEnvironment())
            && getBootstrapClasspath().getFiles().containsAll(options.getBootstrapClasspath().getFiles());
    }

    @Override
    public void checkDebugConfiguration(Iterable arguments) {
        options.checkDebugConfiguration(arguments);
    }

    @Override
    public void setExtraJvmArgs(Iterable arguments) {
        options.setExtraJvmArgs(arguments);
    }

    private static boolean hasJvmArgumentProviders(JavaForkOptions forkOptions) {
        return forkOptions instanceof DefaultJavaForkOptions
            && hasJvmArgumentProviders((DefaultJavaForkOptions) forkOptions);
    }

    private static boolean hasJvmArgumentProviders(DefaultJavaForkOptions forkOptions) {
        return !isNullOrEmpty(forkOptions.jvmArgumentProviders);
    }

    private static  boolean isNullOrEmpty(List list) {
        return list == null || list.isEmpty();
    }
}